Free Simple Circuit Diagram
Simple voltage probe circuit shown in the schematic diagram below very useful in testing, testing, or troubleshooting discrete or integrated circuits, especially logic circuitry. This voltage probe circuit gives two indication, “high” or “low”. Here is the schematic diagram of the circuit: When the “high” condition is probed, Q2 and Q1 transistor will be activated shorting R2 and LED1 to […]
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This is a coincidence detector circuit. This circuit is very useful for monitoring complex logic circuits. This circuit has two inputs, A and B. if A and B are both low, red LED will be on, and green will be on when A and B are both high. The indicator will be off when one of input is low and […]
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Ideally, any testing equipment will not draw any current from the device under test. This ideal condition can be approximated by designing a testing device with a very high input impedance for negligible loading, and this Darlington logic probe circuit could be one of this. This circuit uses two transistor in Darlington configuration. The connection of transistor will give very […]
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Logic probe is circuit that indicates the logic state of the node of any TTL logic circuit. It will work if we must supply the probe with the same power of the circuit that we want to analyze, in other words same Vcc and same GND. The “Test” wire of the probe must be connected to the desired node of […]
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