Digital TTL Voltage Testing Meter Circuit Diagram

Free circuit dot com presents the digital tester circuit,this circuit is checking voltage in TTL with display by 7 segment.
I think the circuit will be using for you apply to your electronic projects.
The function of circuit is sorting TTL voltage with resister to drive transister BC547B after that it will be drive IC model 74SL00 to turn on each segment of 7 segment display.
Part List
IC 74LS00 1 pcs.
T1-T3 BC547B 3 pcs.
R1,R2,R5,R6 10K ohms
R3 47K ohms
R4 8.2 K ohms
7 segment 1 pcs.

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