Electronics Today 1976 09

SEPTEMBER 1976

SOUTH AFRICA

60c

CANADA

Si

T'hh'T1! NEWS

.

.

.

CONSTRUCTION

.

.

.

DEVELOPMENTS

.

-

AUDIO

VOL 5, No. 9

SEPTEMBER 1976

Features 26

OPTO -ELECTRONICS Plastics and their part in electronics

28

CAPACITORS: PART TWO Codings in use and how to use them

38

CMOS-TO MAINS Interfacing mircopower CMOS to high power A.C.

TOSHIBA ST 910 TUNER REVIEWED Top

50;

flight tuner considered

MIRCOFILE PART SEVEN I/O, l/ 0, it's off to work we go!

58

ELECTRONICS IT'S EASY

64

Continuing digital display techniques

72

TECH TIPS Three more pages

of your ideas

10

LOW COST VDU -= PART TWO Constructional details

19'

TWO METRE POWER AMP Boosting outpower to higher levels ETI CLOCK MODS Addition of a 'radio alarm'

37

10OW DISCO UNIT PART ONE

42

Power amps and power supply constructional details

52

BREAKDOWN BEACON Could save you repairs, and perhaps

life!

a

62

RF ATTENNUATOR Precision step unit for use to 150 MHz

Data Sheet LM

3909

55

IC FLASHER

Ultra -versatile IC with millions of applications

MK

50075/50103/50104

The heart

of

a

SCIENTIFIC CALCULATOR SET 56

very sophisticated machine for you to build around

6

NEWS DIGEST ELECTRONICS TOMORROW

70

33 34 36

SUBSRCIPTIONS BOOK SERVICE OCTOBER ETI PREVIEW SPECIALS ETI CLOCK OFFER

41

DIGITAL WATCH READER SERVICES INFORMATION

49 49 82

Special Offers DECON PCB KIT 34% off the most convenient way yet

35 to etch PCB's!

BI-PAIK SEMICONDUCTORS TRANSISTORS

*74 SERIES T.T.L. I.C's

BRAND NEW. FULLY GUARANTEED TYPE PRICE TYPE PRICE TYPE PRICE TYPE PRICE ACII7K *0.30 BC170 *0.31 2N930 009 BF271 *0.21 ACI22 *012 BC171 *0.18 0.09 BF272 *0.81 2NI131 AC125 *0.18 BC172 0.09 BF273 0.36 2NI132 *0.18 *0.14 BC173 AC126 099 BF274 *0.15 0.36 2N1302 *0.11 BC174 AC127 015 BFW19 *0.61 2N1303 *0.15 AC128 *0.11 BCI75 *0.22 BFX29 *0.18 *0.25 2N1304 AC132 *0.15 BC177 *0.16 BFX84 *0.19 2N1305 *0.18

AC134 ACI37 AC14I AC141K AC142

*0.15 *0.15

*0.19

*080

*0.19 AC142K *0.26 *0.16 AC151 AC 153K *0.74 AC154

*0.20

ACI55 ACI56

*0.20 *0.20

AC157 ACI65 AC166

*0.25 *0.20 *0.20

ACI67 AC168 ACI69 AC176

*0.20 *0.25

*015 *011

AC176K. *0.26 AC177 *0.25 ACI78 *0.29

AC179 AC180 ACI8OK AC181

*4129

*0.20 *0.30

*020

AC181K *0.30 AC187 *022 AC187K *0.23 AC188 *0.19 ACI88K *0.23 ACY17- *0.26 *0.20 ACYI8 *0.20 ACY19 ACY20 *020 *0.20 ACY21 ACY22 *0.17 ACY27 *019 ACY20 *0.19 ACY29 *0.36 ACY30 *029 *0.29 ACY3I *0.21 ACY34 *0.21 ACY35 *0.29 ACY36 *0.18 ACY40 ACY41 *019 ACY44 *0.36 *0.39 AD130 *0.49 AD140 AD142 *0.55 *0.49 AD143 *045 AD149 *0.36 ADI61 *Q30 AD162 ADI61 & AD162(MP)

*069 ADTl40 AFI14 AF115 AF116

AFII7 AFI18 AF124 AF125 AF126

AF127 AF130 AF178 AF179 AF180

*0.51 *0.22 *0.22 *0.22 *0.22 *0.32 *0.28 *0.28

*0.26 *0.26 *031 *0.51

*051 *0.51

AF181 AF186

*0.51

AF239 AL102 AL103 ASY26 ASY27 ASY78 ASY29

*0.38 *0.75 *0.75 *0.26 *0.31 80.26 *0.26 *0.26 *0.26

*051

BC178 BC179 BC180 BC181 BC182 BC182L

8C183 BC183L BC184

BC1844

BCY30 BCY31 BCY32 9CY33 BCY34 BCY70 BCY71

BCY72 BCZIO

BCZII BCZ12 BD115

BDI16 BDI21

80123 BD124 BD131

0D132 BDI33 BD135

00136 BD137 BD138 BD139 ODIOS

BDI55 0D175 BD176 BD177 130178 BD179 ODIOS BD185 BD186

BD187 BDI88 BD189 BDI90 BD195 13D196 1313197

ODIOS ODIOS

*041

BC107 BC108 BC109

*0.08 *0.08 *0.08

BCII3

0.10 0.16

016

BFI56

0.16 0.19

BFI57 BF158 BF159

*0.26 *0.26

ASY57

BC114 BC115 BC116 BC117 BC118 BC 119

BC120 BC125 BCI26 BC132 BC134 BC135

*0.26

009 *031 *0.81 0.12 0.19

012 0.19

13F160

BFI62 BF163 BFI64 BF165

BCI39 BC140 BCI41

*0.41

BC142 BC143 BC145 BC147 BC148 BC149

*0.31 *0.31 0.46 0.09

BC150

019 020

BFI67 BF173 BF176 BF177 BF178 BF179 BF180 BFI81 BF182 BF183 BF184 BF185 BF187 BF188 BF194

BCI36 BC137

BC151 BC152

012 *0.16 *0.16 *0.31 *0.31

009 0.09 0.18

9F195

BCI53

029

BF196

BC154 BC157 BC158

0.20

6F197

0.11 0.11 0.11

BF198 BF199 BF200 BF222 BF257 BF258 BF259 BF270

BC159 BCI60 BCI61 BC167 BC 168 BC 169

*0.46

*051 0.10 0.10

010

0.09 0.09

0.12 0.12 0.12 *0.31

BC337 BC338 BC440 BC460

*026

*026

ASY56

0.25 0.09 0.09 0.09 0.09

BC328

ASZ2I

*0.26

jASY55

*0.25

*0.29 *0.29

.ASY58 ASY73

*026

*016

BC186 BC187 BC207 BC208 BC209 BC212 BC212L BC213 BC2I3L BC214 BC214L BC225 BC226 BC251 BC301 BC302 BC303 BC304 BC327

BD200 BD205 BD206 BD207 BD208 BDY20 BF115 BFI 17 BF118 BFI19 BF12U BF123 BF125 BF127 BF152 BF153 BF154 BF155

ASY50 ASY51 ASY52 ASY54

*0.16

0.11 0.11

0.12 0.10 0.10 0.10 0.10 0.10 0.10

026 036 0.10

*0.28

BFX85 BFX86

2N1306 2N1307 2N1300 2N1309 *013 2N1613 *0.13 2N7711 *0.13 2N1809 *013 2N1890 *0.25 *0.22 *0.22 *0.22

13FX87

BFX88 BFY50 BFY51 BFY52 BFY53 BSXI9 BSX20

*0.16 2NI893 *0.16 2N2147 *0.16 2N2148

5SY25 BSY26 BSY27 BSY28 BSY29 BSY38 BSY39 BSY40

*0.16 *0.16 *0.16 *0.16

*0.19 *0.19 *0.29 *0.29 BSY41 BSY95 *0.13 BSY95A *0.13 BUMS *1.90 MATIOO *0.19 MATIOI *0.20 MAT120 *0.19

*025 MAT121 *0.31

MJE521

020 *0.56

*027 MJE2955 *0.88 012 MJE3055 *057

*0.37 *0.25 *0.27 *0.31 *0.22 *0.26 *0.15 *0.20

MJE3440 *0.51 MPF102 *0.28

2N2368 2N2369 2N2369A 2N2411 2N2412 2N2646 2N27I1 2N2712 2N2714 2N2904

*0.39 *0.38 *0.60

-

0C139 0C140

(X 169

0 1X170 0C171

0200 0C201 0C202 0C203 0C204 0C205 0C309

21,12923

*0.12 *0.12

*0.25 *0.25 *0.34 *0.21 *0.21 *0.21 *0.14

2N3614 2N3615 2N3616 2N3646 2N3702 2N3703 2N3704 2N3705 0.48 2N3706

*0.29 *0.29 *0.26 *0.26 *0.38 *0.41 *0.44

ST140

*0.13 2N3819

ST141

*018 2N3820 *040 2N3421 *045 2N3823

NSL4931 ORP60 0.41 2N3707 ORP61 0.41 2N3708 P20 *0.51 2703708 P346A *0.20 21,13710 P397

TIP29 TIP30 TIP31A TIP32A TIP41A

0.46 051 0.46

TIP42A TIS43 1)146 0.51 ZTX107 056 ZTX108 0.46 ZTX109 0.46 ZTX300 *0.71 ZTX500 *0.49 ZN414 *0.56 20301 0.56 20302

*0.43

2N3711

041

2G309 2G339 2G339A

210717

2N7I8

2N718A 2N726 2N727 *0.46. 2N743 *0.28 2N744 *036 2N914 *0.46 2N018

*0.46

2N929

0.09 0.08 0.08

*0.17 *0.19 *0.20 *0.29 *0.43 *0.50 *0.43 *0.46 *0.10 *0.11 *0.20 *0.36

2N5194 2N5294 2N5296 2N5457 2N5458 2N5459 2N6121 25301

2S302A 25302

25303 2S304

*0.08'.25305 2S306 25307 2S321 25322 25322A *051 25323 *0.29 2S324 *0,29 2S325 *0.20 25326 *0.20 25327 *0.15 25701 *0.31 40361 *0.21 40362 *0.09 *0.11 *0.31 *0.38 *0.23

015

9.10

0.11

0.10 0.12

0.13 0.13 0.25 0.15 0.09 0.23 0.26 0.26

7411

7412 7413 7416 7417 7420 7422 7423 7425 7426 7427 7428 7430 7432 7433 7437 7438 7440

028 0.28

912 0.28 0.30 0.30 0.30 0.30 0.42

039 930 0.30 0.12 0.64 0.65 1.10 1.10 0.95 1.10 0.67 0.80 0.12 0.12 0.12 0.12 0.12 0.25

7441

7442 7443 7444 7445 7496

-

7447

7448 7450 7451 7453 7454

7460 7470 7472 7473 7474

021 0.24

025 026

080 1.05 0.65

0.78 0.11

076

0.11 0.11 0.11 0.11

010

0.24

0.23

0.10 0.10 0.10

020

0.26

024

027

0.25 0.46

0.22 0.23

0.48 0.25

950 1.02 0.83

098 090 1.25

0.29 2.70

033

0.58 0.42 0.42

0.50

041

0.94 1.25 0.74 0.93

0.41 0.41 0.66 0.64 0.98 0.36 0.36 0.32 0.52 0.79 0.86 1.15 0.25 0.46 0.54 0.56 0.92 1.20 0.72 0.91

1.45

1.40

0.78 0.78 0.93 0.98

0.76 0.76 0.91 0.96

042 0.68 0.66 0.98 0.38 0.38

034 0.54 0.81 0.88 1.20 0.26 0.48 0.56

058

058

0.60 0.96 1.30 0.76 0.95 1.50 0.80 0.80

095 1.00

098

1.00 1.00 1.00 1.25 1.25 1.48

096

0.98 0.98 1.20 1.20 1.44 0.95 0.93

0.96

096 1.15 1.15

0.88

1.39 0.90 0.91 1.06 1.06 1.06 1.80 0.80

1.62 1.45 1.45 1.10 1.10 1.10

1.38 1.40 1.40 1.05 1.05 1.05

0.90

0.78

1.00 1.00 2.10 1.95

0.98 2.00

0.76 0.96 0.96 1.90

1.90

1.85

1.00 0.05 1.16 1.16 1.16 2.00 0.90

74.2

1.67 1.50

0.23 0.46

74184 74190 74191 74192 74193 74194

0.98 0.79 0.94 0.86 1.15

74195 74196 74197 74198 74199

044

0.24 0.48 1.00 0.81 0.96 0.88 1.20

035

0.26 0.50

74164 74165 74166 74174 74175 74176 74177 74180 74181

0.10

0.37 0.60 0.43

1.25

74161 74162 74163

1.00 1.00 0.85 1.00 0.83

2.80

0.40 0.36 0.56 0.83 0.90

74122 74123 74141 74145 74150 74151 74153 74154 74155 74156 74157 74160

061

290

040

74121

0.36 0.10 0.26 0.35 0.26 0.26 0.10 0.60

030

0.70 0.68 1.00

74118 74119

026

0.32

043 043

74111

0.26 0.10 0.26 0.26 0.26 0.26

021

7476 7480 7481 7482 7483 7484 7485

7492 7493 7494 7495 7496 74100 74104 74105 74107 74110

0.08

022

7475

7491

013 013

022

0.28 0.38 0.11 0.28 0.37 0.28 0.28 0.11 0.62 0.63 1.05 1.05

0.30

0.08 0.09 0.09 0.11 0.11 0.23 0.23

0.25 0.26 0.27 0.27 0.11 0.27 0.28 0.28

028

012

7486 7489 7490

100+

25

1

008

0.12 ; 0.24 0.24 0.14 0.14 0.09

025

1.11 1.11 1.11

190

150 1.15

1.15 1.15

0.98

Devices may be mixed to qualify for quantity price (TTL 74 Series only). Data is available for the above series of IC's in booklet form. PRICE 35p.

UI U2

U3 U4 U5 U6 U7

08 U9 U10 UI I U13 U14 U15 U16 U17 U18

U19 U20 U21 U23 U24

1

VCE

50V 38w

P

VCR lc

20 NPN Sil. trans TO -5 like 2N696 10 3Amp Sil. rect. stud up to 1000 PIV 30 Germ. PNP AF trans. TO -5 like ACY17-22 8 6Amp sil. rect. BYZ13 up to 600 PIV 20 Silicon NPN trans. like 13C108 12 1.5 Amp sil. rect. top hat up to 1000 PIV

*0.60 00.60 *0.60 *0.60 *0.60 .... 0.60 0071 ... *0.60

30 AF Germ. trans. 20300 series & 25 MADT's like MHz series PNP series

*0.60

20 Germ. Amp rect. GJM up to 300 PIV 0 60 U25 25 300MHZ NPN sil. trans. 2N708, BSY27 *0.60 U26 30 Fast switching sil. diodes like 1N914 060 U29 10 1 Amp SCRs TO -5 up to 600 PIV *1.20 U32 25 Zener diodes 408mW DO-7 3-33 volts mixed 0.60 U33 15 Plastic Amp. sil. rect. IN4000 series 0 60 U34 30 Sil. PNP trans. TO -5 BCY26, 25302/4 *0.60 U35 25 Sil. trans. PNP TO -18 2N2906 *0.60 U36 20 Sil. NPN trans. TO -5 BFY50/51 /52 *0.60 U37 30 Sil. trans. SO -2 PNP 0C200. WS322 *0.60 U38 30 Fast switch sil. trans. NPN 400MHz *0.60 U39 30 RF. Germ. PNP trans. 2N1301 /5 TO -5 *0.80 040 10 Dual trans. 6 lead TO -5 2N2060 *0.80 U43 25 Sil. trans. plastic TO -18 BC113/114 060 U44 20 Sil. trans. plastic TO -5 BC 115 0 60 045 7 3A SCR TO66 up to 600 PIV *1.20 U46 20 Unijunction trans. similar to T1S43 *0.80 U47 10 TO220AB plastic triacs 50V 6A * 1.20 U48 9 NPN sil. power trans. like 2N3055 *1.20 U49 12 NPN sil. plastic power 60W like 2N5294 *1.20 1

-

4A

Code Nos. mentioned above are given as a guide to the 'type of device in the pak. The devices themselves are normally unmarked.

*INDICATOR L.E.D. Displays 85p

-

DL747 Jumbo common anode, 0.6" 21.70 DL727 Double digit display, common anode, 0.5" £2.00

-

0.6A 0.8A

*0.29 *0.51 *0.36 *0.29

T018 T092 105 0.13 0.15 0.19 0.22 0.25

10

20 30 50

0.15

3A 5A 5A 7A IGA IBA 30A TO66 4066 T0641.048 7048 T048 TO48

918 922 020

0.28

925 0.36

930 0.25 0.25 931 0.38

100 150

0.48

-- --

Type 1

Quantities 25 100+

018 018

72702 72709 72709P 72710 72741 72741C

0.18

72741P

028

018

72747 72748P

079 0.74 0.61

0.18 0.18 0.18 0.12

SL201C SL701C SL702C TAA263 TAA293

0.46

0.80 *0.57 *0.43 *0.43 *0.57 *0.71 *0.71 *0.71 *0.71

*0.43 *0.41 *0.51

0.50 957 0.57 0.62 0.69 0.78 0.81 0.92

054 1.18 057 058 1.43 0.51

962 0.62 1.63 971

1.79

0.99

0.77 0.90

1.22

1.39

4.07

0.44

0.42

0.23

0.21

0.19

0.19

0.18

0.17

TAA350A uA703C uA709C

0.32

0.31

0.28

uA71IC

0.28

(k27

0.26

020 0.25

0.24

0.26

uA712C uA723C 76003

0.27

0.33

0.46

074 0.93

0.42 0.65 0.88

1.71

0.26 0.10 0.32 0.32 0.45 1.39 1.39 0.88

76023 76660

0.31

042 0.37 040 0.42 0.37

993 945

I.M380

*NE555 *NE556

0.37 0.56

TBA800

0.88 1.39

0.83

ZN4I4

1.11

25 100+ 1.67 1.57

924

0.22

0.18 0.31 0.31 0.43 1.34 1.34 0.86 0.90 0.43 0.86 1.34

017 0.28 0.28 0.40 1.30 1.30 0.83 0.88 0.40 0.83 1.30

- -

SILICON RECTIFIERS 300mA 750mA

PIV 50 100 200

400 600 800 1000 1200

IA'

T007) (S016) 0.05 0.05 0.06 0.07 0.08

0.06 0.07 0.09 0.14 0.16

0.11 0.13

0.18 0.28 0.32

-

1.5A

Plastic IN4001 IN4002 IN4003 IN4004 1704005 IN4006 1N4007 IN4007

0.05 0.06 0.07 0.08 0.09 0.10 0.11

3A

I00V

105 TO66 TO46

0.11

0.12

035 033 0.30

'* DIODES AA119

0.08

BYZI6

0.41

AAI20

008 BYZ17 008 BYZI8

036

AA129 AAY30 AAZ13 BA100 BAI16 BA126 BA148 BA IM

0.00 0.10

BYZ19

0.36 0.28

CG62

010 (OA91 022

Eq) 0.06 CG651 (OA70-0A79) 0.07

0.15

OAS Short

012

Leads

0.21

OA10 OA47

90104

0.15 0.14 0.15 0.15

OA79

0.14 0.07 0.07 0.07

BY100

016 OMI

007

BY101

0.12 OA85 0.18 OA90 0.12 OA91 0.12 0A95 0.15 OA200 0.16 0A202 0.16 SDIO 017 SD19 0.21 IN34 0.51 IN34A 0.43 IN914 036 IN916 0.31 IN4148 0.31 15021 0.26 15951

0.09

0.21

BA 155 BA165 BA173

BY105 BY114 BY124 BY126 BY127 BY128 BY130 BY133 BY164 BYZIO BYZI I BYZ12 BYZ13

0A70

0.07 0.07

007 0.07

007 0.06 0.06 0.07 0.07 0.08 0.06 0.06 0.10

007

UNTESTED AUDIO PACKS Comprising 5 I.C.s 76003/76023 series

V.A.T.

ONLY E1.50 per PAK

Complete with data

Please add 8% to all prices marked * Remainder add 12tí%

BRIDGE RECTIFIERS 2A/5ovRMS 2A/ 100vRMS 2A/200vRMS 2A/400vRMS 2A!1000vRMS

SOLVE THOSE STICKY PROBLEMS! with

0.35 0.40 0.45 0.50 0.60

CYANOACRYLATE C2 ADHESIVE seconds

A$A

-

bonds plastic, rubber, transistors, components permanently, immediately)

OUR PRICE ONLY for 2gm phial

70p*

Postage and packing' add 25p. Overseas add extra for airmail. Minimum order £1

DIACS

200V

0.10

All prices EXCLUDE V.A.T.

The wonder bond which works in 30A

IOA

(SO16) (SO10) (S010) (T048) 0.07 0.14 00.19 * 0.56 0.09 0.16 *0.21 * 0.69 0.12 0.20 *0.23 * 0.93 0.14 0.28 *0.35 *1.25 *0.42 0.16 0.33 1.76 0.18 0.35 *0.51 *1.94 0.23 0.44 *0.60 *2.31 *0.69 0.28 054 *2.88

*TRIACS Case 2 Amp 6 Amp 10 Amp

ß1'S8 8 pin type (low cost) 0.14 0.12 BPS14 14 pin type (low cost) 0.15 0.13 BPSI6 16 pin type (low cost) 0.16 0.14 BPS24 24 -pin type (low cost)

Comprising 5 I.C.s like MC1307 and SN76110

AVDEL BOND 1

0.46

0.35

I

100*

Quantities

TYPe

*056 *0.32 *0.32 *0.41 *0.69 *0.51 *0.43 00.43 *0.56 *0.71 *0.80 *0.80

0.48 0.51

LINEAR I.C's

012

*0.56 *0.56

0.36 0.48

938 0.44 0.25 0.30 0.50 9.30 0.39 055 939 0.48 0.69 -058 065 0.81

200 400 600 800

031

0.10 0.12 0.12 0.12 0.18 0.18 0.18

IA

1.25

FM STEREO DECODER

*THYRISTORS PIV

1.25

ONLY £1 per PAK Complete with data

ITT 5870S

Character height 13.46mm SPECIAL OFFER 5 tor 22.00

ONLY £1.50* for 10

1.25

25

I

BYX38/30

DL707 Common anode, 0.3"

NIXI TUBE

hFE 30-120

1.25

D.I.L. SOCKETS

1

Available in 0.125" and 0.2" dia. lenses Red 10p. Green 17p. Yellow 17p. Mounting clips 2p each 3015F Minitron 7 -segment filament E1.11

60v

TO.3 Plastic Encapsulation uA.7805/L129 5V (equiv. to MVRSV) uA.7812/L130 12V (Equiv. to MVRI2V) uA.7815/L131 15V (Equiv. to MVR15V) uA.7818 I8V (Equiv. to MVR18V)

.

L.E.D.s

SPECIAL POWER OFFER R.C.A. 2N5295. NPN to 3 PLASTIC POWER

008 0.08 0.08 0.08 0.09 0.09

2N4061 2N4062 2N4284 2N4285 2704286

2N4291 *0.36 2N4292 *0.37 2N4293 *0.20 2105172

7409 7410

Oil

Quantities

Type

100+

25 0.09 0.09

009

0.07 0.07 0.07 0.09

*0.41

0.09 0.10

Description Price 120 Glass Sub-min G.P. Germ. diodes 0.60 50 Mixed Germanium transistors AF/RF .. *0.60 75 Germ. gold bonded sub -min like 0A47 0.60 30 Germ. transistors like 0081. ACI28 *0.60 60 200mA sub-min silicon diodes 0 60 30 Sil. trans. NPN like BSY95A, 2N706 *0.60 16 Sil. rect. 750mA up to 1000 9 60 50 Sil. diodes DO-7 250mA like OA200/202 .... 0.60 20 Mixed voltages. Watt Zener Diodes *0.60 20 BAY50 charge storage diodes DO -7 0 60 20 PNP Sil. trans, TO -5 like 2N1132, 2N2904 *0.60 30 PNRNPN Sil. trans 0C200 &25104 *0.80 150 Mixed silicon and Germ. diodes 060

*009

0.29 0.28

2(3306

Quantities 1

7400 7401 7402 7403 7404 7405 7406 7407 7408

*0.78 *0.76

2N3905 2N3906 2N4058 2N4059 2N4060

1.11

Type

VOLTAGE REGULATORS

Pak No.

GUARANTEED.

*069

0.29

20303 20304

2N711

*0.16 015

2N3903 2N3904

0.61 0.41 0.41 0.41

*0.22 *0.15 20344 0.36 2N404 *0.36 2N404A *0.31 2N524 *0.31 2N527 *0.31 2N598 *0.31 2N599 *0.41 2N696 *0.41 2N697 *0.26 2N698 *0.31 210699 *0.28 2N706 0.41 2N706A 0.10 2N708

*0.15

*0.52 *0.60 *0.65 *0.72 *0.25 *0.20 0.07

*0.19 2N4287 *0.19 2N4288 *0.19 2N4289 *0.25 2N4290

20308

*0.18 *0.12 *0.14

2N2924 0.15 2N2925 ' 0.15 *060 2N2926G 0.09 2N2926Y 0.09 *0.45 *051 2N29260 008 *0.20 2N2926R 0.07 *025 2N292613 0.07 *0.16 2N3010 *0.71 *013 2N3011 *015 *0.10 2N3053 *015 *0.40 *0.10 2N3054 *0.15 2N3055 *0.40 *0.15 2N3391 0.15 *0.16 2N3391A 0.17 015 *0.16 2N3392 0.15 *0.26 2N3393 015 *0.16 2N3394 *0.16 2N3395 0.18 *0.21 *0.16 2N3402 *016 2N3403 *0.21 *0.20 2N3404 *0.29 *0.20 2N3405 *0.45 *0.20 2N3414 0.16 *0.26 2N3415 0.16 *0.26 2N3416 0.29 *0.26 2N3417. 0.29 *0.26 2N3525 *0.77

*0.98 *1.02

*0.36

*0.18

*0.22 *0.18 *0.18 *0.18

*0.18

2N2905 *036 2N2905A *0.80 2N2906 *0.47 2N2906A *049 2N2907 *0.37 2N2907A

00012/

0.10 0.12 0.12 0.12 0.12

*0.36 *0.22 *0.18 *0.18

*0.28

*097 00071

0.41

*0.58 *0.36 *0.36

MPF105 OC19 OC20 OC22 OC23

*0.87 *0.92 *0.92 *0.98 *0.98 *0.81 *0.81 *0998

*/1.71

*0.38 *0.73

2N2904A *0.18

0070 *070 0071 *0.36 0072 *0.40 0074 *0.67 0075 0.41 0076 0.41 0077 0.46 0081 0.51 0081D 0.56 0082 0.61 0082D *0.81 0083

*0.71

*0.16 *0.32 *0.46

*0.28

*0.67

*0.15 *0.46

*0.16

MPFI04

0C24 0C25 0C26 0C28 *015 0C29 *0.20 0C35 *0.26 0C36 *0.26 0C41 *0.83 0C42 *0.81 0C44 *0.61 0C45

*0.61 *0.61 *0.67 *0.67 *0.71 *0.71 *0.67 *0.67 *0.71 *0.71 *0.77 *0.77

2N2192 2N2193 2N2194 2N2217 2N2218 2N2218A 2N2219 2N2220 2N2221 2N2222

*0.21 *0.21 *0.24 *0.24

SUPER UNTESTED PAKS

BI-PAK STILL LOW PRICE. FULL SPECIFICATION

400V

BRIOO D32

*0.23 00.23

0.31 0.51

0.51 0.61

0,71

(These

two dracs

0.77

0.77

0.92

1.12

recommended with triacs.)

are for use

PO BOX 6, WARE, HERTS

High quality modules for stereo, mono and

other audio equipment. PUSH-BUTTON

STEREO Enjoy the quality of a magnetic cartridge with your existing ceramic equipment using the new M.P.A. 30, a high quality pre -amplifier enabling magnetic cartridges to be used where facilities exist for the use of ceramic cartridges only. It is provided with a standard DIN input socket for ease of connection.

FM TUNER Fitted with Phase Lock -loop Decoder The 450 Tuner provides instant program selection at the touch of a button ensuring accurate tuning of 4 pre -selected stations, any of which may be altered as often as you choose, by simply'

HcFianging the setttngs of the pre-set controls. Used with your existing audio equipment or with the BI -KITS STEREO 30 or the MK60 Kit etc. Alternatively the PS12 cart be used if no suitable supply is available, together with the. '

Transformer T538. The S450 is supplied fully built tested and aligned. The unit is' easily installed ding the simple instructions supplied.

* * * * *

FET Input Stage VARI -CAP diode tuning Switched AFC Multi turn pre-sets LED Stereo Indicator

VAT ADD PA100 12/2%

Typicidpecification: Sensitivity 3p. volts

Stereo separation 30db Supply required 20-30v at 90 Ma max.

STEREO PRE -AMPLIFIER

POSTAGE &

PACKING Postage & Packing add 25p unless otherwise shown. Add extra for .airmail. Min. £1.00

OUR PRICE

top quality stereo pre -amplifier tone control unit. The six push-button selector switch provides a choice of inputs together with two really effective filters for high and low frequencies, plus tape output. MK. 60 AUDIO KIT: Comprising 'A

and

1

1

.

595

STEREO 3

1

COMPLETE AUDIO. 'd-HASSIS 7+7 WATTS R.M.S.

.

Dimensions

x AL50's. x SPM80. x' 299mm BTM80. 1 x PA100. front panel 35mm. and knobs. Kit of parts to include on/off switch, neon indicator, stereo headphone sockets plus instruction booklet. COMPLETE' PRICE £27.55. plus

2

£13.50

Frequency Response + 1dB 20Hz 20KHz. Sensitivity of inputs Tape Input 100mV into 100K ohms 2. Radio Tuner 100mV into 100K ohms 3. Magnetic P.U. 3mV into 50K ohms P.U. Input equalises to R I AA curve with 1dB from 20Hz to 20KHz. Supply -- 20-35V at 20mA. .

.65

Full instructions supplied.

s

-30

89mm

1

& P

AUDIO AMPLIFIER MODULES

1

AL20 and AL30 units The are similar in their appearance and in their general specification.

62p

TEAK 60 AUDIO KIT:' -postage. Comprising'. Teak veneered cabinet size 161/4"x111/2 "AMAI., other,

parts include aluminium chassis, heatsink and front panel brackét plus back panel and appropriate sockets etc. KIT PRICE 0.20 plus 62p SPÉCIFICATION: postage. Distortion

However, careful selection of the plastic power devices has resulted in a range of output powers from 5 'to 10 watts R.M.S. The versatility of their design makes them ideal for use in record players, tape recorders, stereo amplifiers and cassette and cartridge tape players in the home.

Po= 3 watts f=1KHZ02.5% Harmonic Size: 75mm x 63mm x 25mm Load Impedance 8-16ohm Frequency response ± 3dB Po=2 watts 50Hz-25Hz Sensitivity for Rated 0/P Vs=25v. KL= Swim f=1KHz 75mV.RMS

-

AL20 5w R.M.S. £2.65 AL30 10w R.M.S. £2.95

AL60,

25 Watts (RNIS)

45p

15.

The Stereo 30 comprises a complete stereo pre-amplifier, power amplifiers and power supply. This, with only the addition of a transformer or overwind will produce a high quality audio unit suitable for use with a wide range of inputs i.e. high quality ceramic pick-up, stereo tuner, stereo tape deck etc. Simple to install, capable of producing really first class results, this unit is supplied with full instructions, black front panel knobs, main switch, fuse and fuse holder and universal mounting brackets enabling it to be installed in a record plinth, cabinets of your own construction or the cabinet available. Ideal for the beginner or the advanced constructor who requires Hi-Fi performance with a minimum of installation difficulty (can be installed in 30 mins). TRANSFORMER £245 plus 62p p &p TEAK CASE £3.65 plus 62p p & p. 555 ,

NEW PA12 Stereo Pre -Amplifier corn-.

pletely redesigned for use With AL 20/ 30 Amplifier Nodulea, FeaturetT include on/ off volume.Complete controls. Balance, Bass and Treble with tape output. ei,iS Frequency Response 201e-201Chli (-3dB).- Bass and Treble range 12dS. Input Impedance 1 meg ohm.

ee

* Max Heat Sink temp 90C * Frequency response 20Hz to 100KHz * Distortion better than 0.1 at 1KHz * Supply voltage 15-50v * Thermal Feedback * Latest 3,4,8, or 16 ohms -Tr Input Sensitivity 300m V. Supply Design Improvements * Load 24V .5mA. Size 152mm Signal to noise ratio 80db * Overall size 63mm. 105mm. requirements x 84mm x 33mm. 13mm.

-

Especially designeT to a strict specification Only the finest components have been used and the latest, solid-state circuitry incorporated in this powerful little

amplifier which should satisfy the most critical A enthusiast

Stabilised Power Supply Type SPM80 is especially designed to power 2 of the AL60 Amplifiers, up to 15 watts (R.M.S.) per channel simultaneously. With the addition of the Mains Transformer BNIT80, the unit will provide outputs of up to 1.5A at 35V. Size: 63mm. 105mm. 30mm.

SPM80

A..-

Incorporating short circuit protection. Transformer BMT80 f.2.60 + 62p postage

P512

F

£3.10

-Power supply for AL20/30 PA12, SA450 etc.

Input voltage 15-20v A.C. Output voltage 22-30v D.0 Output current 800 mA Max. zize 60mm x 4Y -mm x 26mm.'

Transfoinfer

'OUR PRICE

BIN

El

P.O. BOX 6, WARE, HERTS.

ksigi

ee

YOU'RE NEVER ALONE WITH AN MPU

TRUTH TABLE DETECTOR CLIP The 548A Logic Chip from H.P. is designed to clip on to a 16 -pin DIP pack IC, when its light-emitting diodes show the logic states of each of the IC's pins simultaneously. It is automatic for all logic families from 4 to 18V DC. Three volt CMOS is tested by connecting a 4.5V supply to an auxiliary power pin. With internal, self-seeking logic circuitry, the 548A locates the supply and ground pins automatically; it can be placed on the IC 'upside down' or 'rightside up'. Total current drawn by the clip is less than 40mA with 15 LEDs on. Input current is less than 15mA, assuring virtually no circuit loading. Inputs are protected to 30V DC for 1 minute. Price is £77. Hewlett-Packard Limited, King Street Lane, Winnersh, Wokingham, Berkshire RG11 5AR.

The worlds largest ever ship, the 550,000 ton 'Batillus' is under MPU control! All engine control monitoring and alarm systems are now run from the system shown in the picture. The video monitors are hooked to the MPU 'Alphaprom' units one per engine which each have 225 alarm points throughout its system. The control room has an alpha -

numeric printer, which reads out to the operator any deviation in levels considered significant, along with precise time codes. New alarms appear as red type, and faults rectified as black. Naturally a loud acoustic alarm is also provided. After all the controller might be colour-blind! CSI BY, P. O. Box 174 Vlaardingen, Holland.

VERY SUBMIN SWITCH

SINGLE -CHIP JFET PREAMPLIFIER

Roxburgh Electronics have a new subminature rotary switch which is sealed in an industry -standard TO -5 can. Designated the Series 30, the switch offers a wide range of configurations, and from 2 to 8 switchpositions.

The first monolithic JFET preamplifiers types T100/300 by Siliconix will serve as single -device replacements for the discrete component assemblies generally used to buffer higimpedance signals from piezo-electric and capacitive microphones/transducers. They operate at low power levels from single DC power supplies of 1.3 to 30V. Applications include hearing aids, microphone preamplifiers and general purpose impedance converters. Two versions have been introduced, both in TO -72 metal can

-

-

packages.

Nominally rated at 0.5A, 125V AC, the switch contacts are capable of handling up to 3A, and the Series has been designed for direct mounting to PCB's, or for panel -mounting by means of an optional bush. A thumbwheel switch is also available. Roxburgh Electronics Limited, 22 Winchelsea Road, Rye, Sussex.

No external components are required for operation with devices such as ceramic electret -condenser, and air -condenser, microphones, or piezo-electric capacitive transducers. Each chip contains an N -channel depletion -mode, junction field effect transistor (JFET), with a diffused source resistor and back-to-back Schottky diodes. The diodes from the high -impedance, gate -bias resistance. The circuit is self biasing. Siliconix Limited, 30A High Street, Thatcham, Newbury, Berks RG13 4JG.

SHARP PRACTICES IN WATCHES? One very interesting little snippet caught our eye last month Gillette, the well known face scraping company, are adverting in the USA for. digital watch engineers. Both LCD and LED men are required, as are I2L logic designers. With their past history Gillette can't fail to carve themselves a good chunk of the market,

-

(literally!).

GAMES FOR HIRE Later this year Fairchild Semiconductors who have recently taken a hand in digital watches, will be introducing their long awaited TV games chips into Europe. These are based on the F8 microprocessor, and according to Fairchild, can handle teletext as well. In order to assure themselves of a market, the company plans to do a deal with a TV rental company so that games could be hired with the set. The cost to the user would be about £1 extra on top of a colour rental.

TIME BOX

HOME ON THE (TEXAS) RANGE

Not for pursuit of Daleks, but ideal for digital clocks, this new case from West Hyde is moulded in antistatic ABS with 3%mm walls. It has high impact strength, and integral front feet which lift the case to good viewing angle. Two positions for PCB's

will flow. In order to speed this flood, they have an extensive new range with

The consumer electronics fields is about to be asked to hear the weight of yet another giant. Texas Instruments are placing their highly digital boots firmly in the earth of the home market, and expect them to take root there, and grow to 93% of their total business in 1978. Whether or not they achieve the full bloom of this success depends entirely as to whether you and I take to the gifts the giant comes bearing. It almost gives one a feeling of power does it not? As a starter T.I. have introduced 16 digital watches, 12 of which are in plastic cases. Technology is 12L, not

several very ingenious machines. At the low cost end we have the TI 1600,

are provides.

Available in white, red, orange and blue in any quantity, all have 3mm thick red acrylic window panels. Dimensions: 56mm x 131mm x 71.5mm deep. Prices: 1 off £1.79 100 off less 25%. West Hyde Developments Limited, Ryefield Crescent, Northwood Hills, Middlesex HA6 1NN.

-

NEW CATALOGUE FROM MARSHALL'S One of the catalogues which we at ETI refer to most has just been updated: that from Marshall's. The new edition has 160 pages considerably larger than the previous one. More information of semiconductor lead -outs are

-

the ubiquitous MOS a move to newer pastures, broken by Sinclair. The range is priced from £15.95 to around £32. Yer pays yer money and takes yer choice of case and strap, the modules are the same in all the watches, and give 5 functions as usual. The styling is certainly carefully thought out, and new types will be dropped onto the public as and when T.I. deem it timely to do so. A calendar feature is incorporated,

-

slimline rechargable at £17.95. Especially for the student, the TI 30 possess no less than FIFTEEN levels of parenthesis. It also has full scientific facilities, and will turn off the display if you're wasting battery power. a

Price £19.95. The TI 5050 and 5040 are thermal printing machines, the former portable at £99, and the latter desk -bound for £109. Perhaps the most amazing of all is the SR -60. Defined as a calculator only because it requires no peripherals to work, it has a possible 1920 programme steps and 100 memories! The display is alphanumeric, and can interrogate the user if programmed to! Well, it prompts him anyway, (It is

-

included

as is a

new listing of

Japanese equivalents.

For callers the price also available by post

is

30p but it's

for 40p from

A. Marshall, 42 Cricklewood Broadway, London NW2 3ET.

CLOCK MODULE SHRINKS The interest generated by the MA1001 series of clock module subsystems has encouraged National to introduce a further series, designated MA1002. This new series miniaturises the complete module to a package only 7.5mm x 3.5mm, Various versions are available for 12/24 hours formats and input frequencies, and further details are available on request from National Semiconductor, 19 Goldington Road, Bedford, MK403LF.

to

preset to 4 years of correct month length. However since the batteries last you at most a year, and date info is lost on switch -off (battery change) so don't get too excited with the idea.

Marketing

is

to

be

through anybody

and everybody who will sell the watches, so they will be around very quickly. The displays are all LED but Texas are expending many hours of toil in the LCD field, and expect to

bring to fruition a watch with this display sometime during 1977. Calculators are the other channel from which T.I. hopes our money

be hoped we don't get an SS machine just yet! Ve hav vays of making you compute and all that). The tings the SR 60 won't do are very -few indeed, but for circa £1500 perhaps this is not too surprising. Before we are deafened by crys of 'MPU's rule OK' let us add hastily that this is not an MPU machine, but is calculator chip based. The range all use T.I.'s new (?) Arithmetic Operating Logic, said to be truly arithmetic in operation. In practice it looks like an improvement on ordinary arithmetic logic certainly, and anything is an improvement on RPN!

7

news COLOUR OSCILLOSCOPE The Scopex 4D25 now includes a special 'Glarecheq' graticule for 'refelection-free' measurement. This does not decrease the brilliance of the trace or increase the spot size but acts to down extraneous reflection.

As a 'reaction against drabness in instrumentation', a pleasant shade of

blue has been selected for the front panel, and the controls and bezel have been colour matched. Technically the 4D25 offers 3% accuracy on both time and voltage measurements, and incorporates a 25MHz bandwidth with Y -amplifier signal delay. Apart from which think how well it will match the wallpaper! Price £245. Scopex Intruments Limited, Pixmore Industrial Estate, Pixmore Avenue, Letchworth, Herts SG6 1 JJ. IN 3 x 106 YEARS TIME, IT WILL BE ONE SECOND SLOW!

RCA are working for the US Navy to determine the feasibility of using hydrogen maser clocks -- precise to one second in three million years -- in Global Positioning Systems (GPS) satellites. These satellites are part of a tri service programme under Air Force direction. NTS-1 was launched in July 1974 and tested rubidium clocks. NTS-2 will test cesium clocks; NTS-3 will test hydrogen maser clocks. A planned constellation of 24 GPS satellites will be continusously transmitting time synchronized signals. A ship, airplane or land craft suitably equipped to receive the signals, will be able to determine its exact position anywhere on the glode. Hydrogen atoms are employed because of an extremely stable fixed frequency generated under certain controlled conditions. The atoms are produced from hydrogen gas molecules by an electrical discharge and beamed intp a special container in a microwave cavity. The hydrogen atoms undergo an energy state change and emit a frequency that can be used to very accurately control the output frequency.

Can you just see the thing ticking away merrily on your mantelpiece? The BBC would have to phone you for a time check about 5976 AD!

-

£37.286 PER DIGIT! The Data Precision 175 is a full function, 32 range battery and line operated instrument, whose basic sensitivity is 100mV. With 5 ranges of DC/AC voltage measurement and 100% overrange capability per range, the 175 measures from 1001/V to 1000V, protected to ±1000V on any range (including 100mV). Basic instrument accuracy is 0.1%, and this is a 1 year specification over a ±50 temperature range. Resistance measurements are catered for from 100m&2 to 20M2 in 6 ranges (basic accuracy of better than 0.1%). A 'low voltage' mode is provided having the same ranges as the normal resistance measurement, but with only 300mV of open circuit excitation. This enables resistance measurements to be made on circuits while still connected to semiconductor devices. The £120 the Model 175 costs brings, in addition to the basic instrument, its rechareable battery module, a pair of fuse protected test leads, mains lead with charger, alligator clip adaptors and a complete certificate

of traceability.

The experiment follows one by Piccadilly Radio in April where, apart from certain records already encoded, the Staion's output for two days was synthesized via the QS system into 4 -channel. The Independent Broadcasting Authority monitored and transmissions. We can only hope for the experiments to spread, with perhaps good ole Auntie taking a hand (or four!).

-

-

NO, THE WHISTLE ISN'T DIGITAL

This hand-held battery -powered stopwatch measure time to 50 minutes, 59.9 seconds in one -tenth second intervals. Controls allow simple start/ stop, Time IN/Time Out, and include safeguard against accidental reset. Accuracy is controlled by a quartz crystal, and the display LED. Weighing 6oz., the ET105 is approximately 41/2 x 21/2 x 1'/z ins, and will slip into a

jacket pocket. Price to be announced. Newitt and Company Limited, 81 Goodramgate, York Y01 2LU. IC IN CAMERA Contained in a 16 pin DIP the ZNA134 is a complete system, requiring only a single 5V supply. An on chip oscillator (which can be overdriven) externally permits multiple SPG

Parnell International Instruments Limited, Sandbeck Way, Wetherby, West Yorkshire LS22 4DH.

FIRST LIVE 4 -CHANNEL BROADCAST Live quadraphonic broadcasting experiments- have been conducted by Radio Clyde (the commercial station servicing the Glasgow area). Four and a half hours of the "Proms 76" concerts, by the Scottish National Orchestra, were broadcast in four channel mode, direct from Kelvin Hall, Glasgow. on June 26 and July 2, using encoded signals. The encoding system used for this experiment was the Sansui QS Matrix.

unit

usage.

The ZNA134 incorporates such features as synchronising between units, direct reset to horizontal and vertical counters, facailities for adding and subtracting lines, automatic interlacing and a field reference output. Perhaps its most novel feature is its abaility to provide both CCIR and EIA equalisation by changing the voltage on a single pin. The ZNA134 generates all the horizontal, vertical, mixed blanking and synchronising pulses necessary for raster generation in 625 or 525 line commercial, industrial or military TV systems. It can be supplied to operate over the military temperature ranges. Ferranti Limited, Electronic Components Division, Gem Mill, Chadderton, Oldham OL9 8NP.

a st Marshall'

A Marshall: (London) Ltd Dept: ETI 44Q 42 Cricklewood Broadway London NW2 3ET Tel: 01-452 0161/2 Telex: 21492 & 85 West Regent St Glasgow G2 2QD

d

Top 500 Semiconductors from the largest range in the UK manufacturers branded stock 0.12 1401L

29491

29492 29493 29696 2N697

25698 2N699 25706

2970645 2N708 25709 25711

2N718 257184 2N720 25914 2N916 25918 25929 '2N930 2N1302 2N1303 251304 291305 251306 2N1307 251308 251309 251671 2516714 2N16716 251711 251907 252102 2N2147 252148 252160 2522184 252219 2522194 2N2220 2N2221

2522214 292222 2922224 292368 2923694 292369 252646 292647 292904 2529044 252905 2929054 252906 2529064 2N2907 2529074 252924 2N2926 2N3053 253054 253055

1.54 1.70 4.60 5.10 5.75 5.98 0.25 0.16 0.82 0.55 0.12 0.12 0.21 0.50

0.55 0.22 0.40 0.69 0.22 0.43 0.34 0.25 0.26 0.37 0.45 0.40 0.40 0.31

0.30 0.60 0.60 1.80 1.92 2.12 0.27 5.50 0.60 1.40 1.65 1.10 0.47 0.42 0.52 0.35 0.22 0.25 0.25 0.25 0.17 0.21

0.25 0.55 1.10 0.36 0.37 0.37 0.35 0.28 0.25 0.21 0.22 0.15 0.13 0.25 0.50 0.65

2N5295 255296 255298 255457 255458 255459 255492 255494 255496 295777 296027

0.37 0.29 0.34 0.14 0.15 0.15 0.30 0.15 0.17 0.23 0.27

1.40

2N3391

2533914 253392 2N3393 2N3394 253402 2N3414 253415 253416 253417 2N3440

39'28

0157

0.78

2N3441 2N3442 253638

35139 39140 35141 35200

1.20 0.16 0.16 0.30 0.20. 0.17 0.15 0.15 0.15 0.14 0.18 0.14 0.15 0.14 0.15 1.20 2.30 2.45 2.45 2.60 1.60 1.70 2.65 3.15 2.75 2.75 2.90 0.26 0.26 0.29 0.61

2936384 253639 293641 2N3702

293703 2N3704 2N3705 293706 253707 253708 253709 253710 293711

293712 253713 253714 293715 293716 253771 293772 253773 253779 2N3790 253791 2N3792 293794 2N3810 253820 253823 2N3904 253906 294036 254037

40361

40362 40363

40389 40394 40395 40406 40407 40408 40409 40410 40411 40594 40595 40601 40602 40603 40604 40636 40673

0.22 0.67 0.55 0.20 0.15 0.20 0.17 0.18 0.17 0.30 0.85 0.90 0.60 0.65 0.70 0.70 1.30 1.00 7.10 0.35 0.40

21114059

254060 254061

254062 254126 254289 294919 294920 254921 254922 254923 255190 255191 255192 255195 255245 255294

AF186 A1200

41239

AF240 AF279 AF280 AL102 AL103 BC107 BC108 BC109 BC113 1.45 BC115 0.85 BC116 0.85 BC116A 2.60 BC117 0.45 BC118 0.48 BC119 1.00 BC121 0.50 BC125 1.20 BC126 1.20 BC132 0.45 BC134 0.38 BC135 0.50 BC136 0.55 BC137

0.55

80140

2.30 0.75 0.85

BC141

0.70 0.50

BC147 BC148 BC149 BC153 BC154 BC157 8C158 BC160

0.60

0.60 1.15 0.73 0.37 0.44

AC126 AC127 AC128 AC151V AC152V AC153 AC153K AC154 AC176

0.21

2N4058

0.40 0.36 0.36 0.29 0.26 0.29 0.42 0.45 0.50 0.45 0.45 0.50

BC142

50143

0.57,BC1678 0.35 '80168B 0.50 BC168C 0.40 BC169B 0.42 BC169C 0.45 130170A 0.40 BC171 0.45 80172 0.40 Be177 0.45 80178 0.65 BC179 0.75 BC182 0.74 50182880 1.20 BC183 1.23 BC183L

40176K AC187K AC188K

40142 40143 40149 AD150 A0161 40162 AF106 AF114 AF115

1.23

0.45 0.65 0.65

0.65 0.65 0.65 0.65 0.65 0.65 0.69

41118 AF124 AF125 AF126 AF127 AF139

0.50 0.70 0.74 0.90 0.80 0.85 1.50' 1.50

BC2596 8C261A BC2628 BC263C BC300 BC301 BC303 BC307

603085 0.12 803090 0.15 BC317 0.17 BC318 0.19 BC337 0.19 BC338 0.20 BC547 0.22 BC548 0.16 BC549 0.30 BCY30 0.45 130831 0.18 8CY32 0.25 130533 0.30 BCY34 0.15 eCY38 0.15 80042 0.19 BCY58 0.14 BCY59 0.60 BCY70 0.65 BCY71 0.30 BCY72 0.30 130115 0.10 BD116 0.10 00121 0.13 50123 0.27 BD124 0.27 80131 0.12 BD132 0.11 50135 0.78 50136 0.12 BD137 0.12 80138 0.12 i50139 0.12 50140 0.12 80529 0.16 50530 0.14 8DY20 0.12 8E115 0.19 5E117 0.18 6E121 0.14

0.21 0.11

5E123 5E152

0.14

13E153

0.11

8E154

BC184 BC184L

0.14 0.12 0.14

130159 13E160

00207

0.11

58166 6E167 58173 BF177 6E178

BC208

0.65. BC212

AF116 AF117

1

Trade and export enquiries welcome. Catalogue price 40p (30p to callers).

Call in and see us 9-5.30 Mon -Fri 9-5.00 Sat

29456 294564 294574 29490

Tel: 041-332 4133 & Straits Parade Fishponds Bristol BS16 2LX Tel: 0272-654201/2 & 27 Rue Danton Issy Les Moulineaux Paris 92

BC212L BC214L BC237

80238 130239 BC251

80253 BC257A

502584

0.10 0.14 0.14 0.17 0.14 0.12 0.15 0.15 0.22 0.17 0.17

8E161

131179 13E180

6E181 8E182

6E183 5E184 5E185

0.18 0.21 0.19 0.31

0.45 0.45 0.60 0.20 0.18 0.25 0.14 0.13 0.19 0.21

0.12 0.10 0.13 1.03 1.06 1.18

0.90 0.98 2.00 0.60 0.55 0.32 0.25 0.26 0.24 1.20 1.20 2.00 2.00 2.00 0.51

8E194 8E195 5E196 8E197 5E198 5E200 BF225J 5E244 6E245 8E246 8E254 8E255 8F257 8E258 8E259 5E459

0.11

0.13 0.14 0.15 0.29 0.25 0.35 0.34 0.75 0.20 0.20 0.37 0.49 0.49 0.39 0.24 2.60 1.04 0.30 0.27 0.36 0.38 0.38

BFR79

515214 BFS28 5E561 8E598 8FX29 BFX30 BFX84 BFX85 BFX87 BFX88 BFX89 BFY50

0.41

0.35 0.32 0.75 0.30 0.38 0.36 0.34

BFY51

8FY52 BFY53 5E790 BRY39 BSX20

1.27

0.50 0.31

0.32 0.54 BSX21 3.05 0.34 8X105 2.40 0.36 612 205 1.10 0.36 CA30804 1.80 CA30304 0.39 0.85. 0.42 CA30284 .0.80 0.46 CA3035 1.62 0.35 CA3052 0.73 0.38 CA3046 2.15 1.13 CA3048 2.00 0.36 CA3089E 4.25 0.70 CA3090Q 0.47 0.55 LM301A 1.32 0.55 LM3085 1.80 0.25 LM309K 0.98 0.25 LM380 2.07 0.25 LM381AN 0.75 0.35 LM702C 0.30 LM709705 0.98 0.60 LM741CAN 0.38 0.35 0.40 BDIL 0.40 0.33 14D1L 0.45 0.33 LM710 0.38 LM3900N 0.55 0.60 0.45 LM723C 0.48 LM741T099 0.40 0.36 LM709CAN 0.48 0.40 0.36 8018 0.38 0.35 14DIL 0.78 0.35 LM747EN 0.78 0.35 LM748 0.44 0.35 BDIL

- All devices

LM7805P LM7812P LM7815P LM7824P MC1303 MC1310 MC1330P MC7351P

MC1352P MC1466L MC1469R ME0402 ME0404 ME0412 ME4102 ME4104 MJ480 N1J481

0.41 1.99 1.99 1.99 1.99 1.47 1.96

0.75 0.87 0.87-

3.95 2.80 0.20 0.15 0.20 0.10 0.10 1.65 1.30

MJ490 MJ491

MJ2955 MJE340 MJE370 MJE371 MJE520 MJE521

MJE2955 MJE3055 MP8111 MP8112 MP8113 MPF102 MPSA05 MPSA06 MPS/112 MPSA55 MPSA56 MPSU05 MPSU06 MPSU55 MPSU56 NE555V NE556 NE560D NE561

NE565

0028 0035 0042 0045 0071

0072 0081

0083 ORP12

053 SL414A SL610C

586110 SL612C SL620C SL621C SL623 SL640C SL641C

05760035 05760135 S576023N 59760250 ST2

TAA300 TAA263 TAA350 TAA550 TAA611C

1.25

2.48 0.60 2.25 2.15 1.32 2.50 1.69 0.98 0.85 2.90 0.30 0.50 0.60 0.62 0.75 1.00 1.50 1.70 8.35 0.70 0.90 0.80 0.85 0.85 1.25 1.45 1.70 1.00 1.20 1.00 0.50 0.30 0.15 0.15 0.20 0.15 0.15 0.18 0.23 0.22

TAA621

7446618 TBA641B T5A651 TBA810 TBA820

784920 T1L209

TIP294 TIP30A TIP31A TIP324 0.58 TIP33A 0.68 TIP34A 0.87 TIP35A 0.65 TIP364 0.75 TIP41A 1.25, Tt P424 0.75 TIP29c 0.35, TIP30c

1.05 1.55 1.00

0.40 0.45 0.30 0.20 0.20 0.35 0.20 0.20 0.40 0.40 0.45 .0.45. 0.48 1.30 4.48 4.48 1.30 2.00 1.50 0.50 0.75 0.45 0.45 0.75 0.50 0.60 1.80 2.35 2.35 2.35 2.35 3.50 3.50 5.75 4.00 4.00

2.36 1.50 1.95 2.50 0.20 2.67

TIP31c TIP32c TIP33c TIP34c

.TIP413 TIP42c 1112955

TIP3055 TIS43 ZTX300 ZTX3C1

'ZTX3C2 ZTX5C0 ZTX5C1 ZTX502

ZTX530 ZTX531

Mini ceramic capacitors 10E-0 01 5mF 5p

1

Polystyrene capacitors OpF--1500pF 5p 15000F 3300pF

NEW RANGE TOOLS HIGH QUALITY MINIATURE ELECTRONIC PLIERS INSULATED HANDLES Round nose box joint 4" long £2.50 Diagonal cutters box joint 4" long Flat nose box

SN7407

SN7408 557409 SN7410

0.51

0.18

0.18 0.18 0.16

0.25 0.40 0.43 0.43 0.16 0.26 0.27 0.27

SN7412 057413 SN7416

LEDs RED YELLOW GREEN

SN7417 SN7420 SN7423 SN7425 S57427

0.16 0.27

097430 097432

S57453

0.16

0.35

057438

0.35

057454

0.16

S57440 057441 057442 SN7445

0.16 0.76 0.55 0.94 0.86

S57460 557470 SN7472 S57473

0.16 0.32 0.26 0.30

0.81

SN7475

557446 S57447 057448 057450

557474

0.85' SN7476 0.16 S57480 0.16 SN7481

S57451

0.30 0.40 0.36 0.45 1.70

057482

057483 SN7484 057485 S57486 SN7490 S57491 SN7492 S107493

SN7494 057495

"15% DISCOUNT

-

SEE MARSHALL'S FOR

CMOS 0.20 C04018

CD4000 C04001 CD4002 CD4006 CD4007

0.20.004019 0.20 1.16 0.20 0.97 0.57 0.57 0.20 0.20 0.59

004008

CD4020 CD4021 CD4022

004023

00401 5

CD4024 CD4025 CD4027 CD4028 CD4029 1.01 CD4030 1.01 CD4031

CD4016 CD4017

1.01 CD4041

CD4009 CD4010 004011 CD4012 CD4013 CD4014

0.56 004037

4 -pin,

180

5 -pin

.

LINE SOCKETS 3

pin. 5 pin 180

,

- 10p

5 -pin

,

14p each

(screw top). Red, White, Black, Green

-- 10p.

3 -way

0574100

FOR 100

0.78 1.15 0.30 0.90 1.80 0.34 0.45 0.40 0.72 0.74 1.20

SN74153 0574154 SN74155 0574157 SN74160 6574161 SN74162 S574163 SN74164 5574165 SN74167

MIX"

12p,

6 -way

25p, 8 -way 35p

mono plastic plugs '4" mono chrome plug 1/4" mono line socket 1/4" plastic switch socket 1/4" stereo plastic plug '/4" stereo chrome plug '/4" stereo plastic line socket Y4" stereo chrome line socket 14 " stereo plastic switched socket 3.5mm plug 3.5mm socket 3 5mm Tine socket 2.5mm plug 2.5mm socket

1/4"

speaker.

LINE PLUGS (same colours) -- 10p PHONO CHASSIS SOCKETS: Double 10p,

057496

0.85 S574107 1.25 S5741180.29 S574119 0.43 5574121 0.68 SN74122 0.43 SN74123 0.43 S574141 0.74 SN74145 0.59 SN74150

JACK PLUGS & SOCKETS

speaker.

PHONO PLUGS or yellow

0.92

0.77 0.73 1.29 1.20 0.68 1.20 1.20 1.20

1.20 0.93 0.93 3.70

0.83

1.01 CD4042 0.57 CD4043 1.12 004044 1.01 004045 0.97 CD4046 0.20 CD4047 0.79 CD4049 0.20 CD4050

0.91

0.85 1.30 1.20 0.95 0.56 0.56 1.54 1.70

0.56 004510 0.91 CD4511 1.17 CD4516 0.57 CD4518 2.26 CD4520

1.54

1.38 1.38 4.07

0.97 004553 0.83

4700pF-0.01 mF

20p

Veroboard 0.15

25x3'4on

36

171n

44 44 49 1.73

PINS%36 200

1.16

2

5x5;1

3'/,x3'/