High/Low Voltage Probe

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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