User Manual KL-31001

DIGITAL LOGIC LAB KL-31001 USER MANUAL

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INITIAL INSPECTION AND PROCEDURES Before operating the system for the first time, perform the initial inspection by following these procedures: 1. Check your local AC source and set the voltage selector switch at the back of the KL-31001 accordingly, either 110V or 220V AC, 50 or 60Hz. NOTE : Excessive voltage will damage internal components while low voltage will cause inaccurate outputs. 2. Connect the mains cord between KL-31001 and AC socket. 3. Check the fuse socket to see if there is a fuse (1A @ 110V, 0.5A @ 220V) inside. If there is, turn on the power switch and the 7-segment LED displays should show “0000”. Check other supply units with oscilloscope, frequency counter, and multimeter to see if the outputs are correct.

1. ADJUSTABLE POWER 1.1. Specifications  Range : +1.5V ~ +15V  Maximum Output Current : 0.5A  Built-in overload protection 1.2. Operation  Turn the knob clockwise to increase output, counter clockwise to decrease the output. 1.3. Circuit Analysis  Fig. 3-2 is the circuit diagram of the adjustable DC power supply. U301 (LM317) is the voltage adjustment control, its reference voltage Vf is 1.25V. R301, R502 and R302 are used for voltage control.

4. If you find any discrepencies or maltifunctionings, please disconnect power immediately and notify your local distributor or King Instrument Electronics Co. Ltd.

2. FIXED POWER 2.1. Specifications  Range : +5V/1.5A ; -5V/0.3A ; ±12V/0.3A  Built-in overload protection 2.2. Operation  4 terminal with +5V, -5V, +12V, -12V 2.3. Circuit analysis  Also shown in Fig. 3-2, the circuit is constructed with 78XX and 79XX series ICs. The output are ±5V ; ±12V.

3. LINE SIGNAL 3.1. Specifications

the internal fine adjustment U105, U109 and U110 are frequency dividers. U112 is an amplifier.

 Frequency : 50/60Hz  Output Voltage : 6Vrms  Built-in overland protection 3.2. Operation Equipped with a 50mA fast-blow type fuse to protect the transformer from accidental damages. 3.3. Circuit Analysis Also shown in Fig. 3-2, it is connected directly to the transformer. Output is 6Vrms/0.1A.

5. STANDARD FREQUENCY 5.1. Specifications  Frequency : 1MHz, 50/60Hz, 1Hz  Accuracy : ±0.01% @ 1MHz  Fanout : 10 TTL loads 5.2. Operation 1Hz, 1MHz and 50/60Hz outputs, TTL and CMOS level outputs. 5.3. Circuit Analysis

4. CLOCK GENERATOR 4.1. Specifications  Frequency : 1Hz ~ 1MHz, 6 ranges, continuously adjustable  Fanout : 10 TTL loads 4.2. Operation Six range from 10Hz to 1MHz ; FREQUENCY knob for fine adjustment (X0.1 ~ X1) ; TTL and CMOS level outputs. 4.3. Circuit Analysis Shown in Fig. 3-3, U108a, U108b act as an Astable Multivibrator. R501, R116, R117 and C103 determine the oscillation frequency (adjustable from R115). R116 act as

 Shown in Fig. 3-4, CY101, C101 and C102 makes up a π network which shifts the 10MHz output of CY101 by 180° and triggers oscillation. R101 is a biased feedback resistor that provides bised input DC current. CY101’s 10MHz output is divided to 1MHz by U102 and amplified by U107a and U107b. The 1MHz output is subsequently divided by U103, U104, U105, U106 into 1Hz output.  CR101 is a rectifier while U101a/b/c are pulse trimmers for the 50/60Hz output. The actual output (50 or 60Hz) is determined by local AC source.

6. DATA SWITCHES 1

NOTE : SW0~SW3 have the exact same functions.

6.1. Specifications  Two 8-bit DIP switches, 16-bit TTL level output.  Fanout : 10 TTL loads 6.2. Operation Two 8-bit DIP switches 6.3. Circuit Amalysis As shown in Fig. 3-5, there is a +5V output when the DIP switch is “ON”.

8. PULSER SWITCHES 8.1. Specifications  2 independent toggle switches with Q and Q’ outputs.  Pulse width : > 5mS.  Each switch equipped with DEBOUNCE circuit.  Fanout : 10 TTL loads. 8.2. Operation

7. DATA SWITCHES 2 7.1. Specifications  Four toggle switches with DEBOUNCE circuit  Fanout : 10 TTL loads. 7.2. Operation  Four toggle switches 7.3. Circuit Analysis 

When S505 is “OFF”, the +5V output will charge C107 through R150 until C107 reaches its full capacity of 5V. Bouncing noise occurs when S505 is “ON” and is cleared when C107 discharge through R149. U116 is a Schmitt triggers circuit that monitors the status of C107 and triggers rapid output changes. U117 and U118 are output amplifiers.

Two toggle switched with TTL; CMOS; Q’; Q outputs. 8.3. Circuit Analysis  As shown in Fig. 3-6, the flip-flop made up of U114f/U114e is capable of eliminating bouncing noise generated by S504. When U114f goes from “Lo” to “Hi”, positive voltage charges the differential circuit of C106 and R139.  Inversely, when U114f goes from “Hi” to “Lo”, C106 discharges toward R139, the discharge time is T = 0.8 X C106 X R139. The discharge time determines bandwidth of the output pulse. U114a and U114d are single-pulse buffer gates which drives U115a, U115b, U115d, U115e with sufficient current. NOTE : Pulser switch A and B has exact same functions.

9. THUMBWHEEL SWITCHES 9.1. Specifications 2-digit, BCD output, common point input 9.2. Operation Two BCD thumbwheel switches, binary output, commonpoint input.

 Note that all terminals use TTL signals as input voltage. Excessive input voltage will damage the display. 10.3. Circuit Analysis As shown in Fig. 3-7-b, +5V is connected internally. U120 is decoder. NOTE : D0~D3 have the exact same functions

9.3. Circuit Analysis As shown in Fig. 3-7-a, the output terminal is connected trough R124 to establish a standard level.

10. DIGITAL DISPLAY 10.1. Specifications  4 independent 7-segment LED displays  With BCD, 7-segment decoder/driver and DP input terminal  Input with 8.4.2.1 code

Table 1

10.2. Operation  Four 7-segment LED displays, BCD input, displays digits 0~9. Digits 10~14 are displayed according to table 1:  “15” will not be displayed. A is the LSB (or “1”) of binary signals, D is the MSB (or “8”) of binary signals. DP is decimal point input and is ON at “Low” state. A, B, C, D input terminals are all ON at “Hi” state.

11. LOGIC INDICATOR 11.1. Specifications  16 independent LED for “Hi”/”Low” logic state indication  Input Impedance : 3.5V ±0.2V, Hi, LED ON, BUZZER ON (3) PULSE : When the switch is set to “PULSE” and the input sequence is “0” – “1”– “0” – “1”, the yellow LED and the buzzer will be ON (4) MEM :

13. LOGIC PROBE 13.1. Specifications  TTL and CMOS level indication  3mm LED displays  “Low” and “Hi” LED for low/high logic state indication 13.2. Operation

When the switch is set to “MEM” position, the PULS LED will be ON 13.3. Circuit Analysis As shown in Fig. 3-9, U310 is the center of the probe. LM339 is a comparator IC. R310, R312, R313, R314 AND R315 determines the incoming signals. S511 switch between TTL and CMOS output. R319 and R320 determines the frequency and tone of the buzzer.

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