Mini Logic probe with transistor circuit

Posted on Feb 7, 2014

This is a Logic probe circuit is one, That is suitable for checking the voltage levels in the TTL circuit. It receives from the circuit being tested. Shows how high or low logic level one. The circuit when the input voltage to the probe Tip is higher than 2. 1 volts (state logic high ). Transistor Q1 will run the light emitting diodes (LED) LED1 rec

Mini Logic probe with transistor circuit
Click here to download the full size of the above Circuit.

eive direct bias will come out shining. Show the logic high (high). When the collector voltage of Q1 running it will fall. and Since the input entered at the end of probe is connected to one end of resistors R4, joint base / emitter of transistor Q2. and Light emitting diode LED2 will get back to bias Q2 and LED2 does not work.

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