Simple Short Finder Circuit

Inside Circuits
Transistors Ql and Q2, together with resistors Rl through R7, make up the input balancing stage, which senses the resistance between points X and Y. The input stage is essentially a bridge, consisting of Rl, R2, R6, R7, and the resistance between points X and Y. Transistors Q3 and Q4 and their associated passive components form a buzzer, which sounds when the tester detects a short. The buzzer is controlled by the output from Q2. When the input resistance is high (more than about 10 ), Q2 turns on, so its collector potential is close to ground, and the buzzer remains off. When the input resistance is sufficiently low, Q2 turns off, and the buzzer sounds.
Simple Short Finder Circuit - schematic

The frequency of the sound, which is about 1000 Hz, can be adjusted by varying the value of capacitor (C).

Recommended videos

  • Circuit Troubles (Basic Circuits and Common Problems)
    Duration: 7:13.
  • Introducing the ECT2000 Short and Open Finder
    Duration: 2:48.
  • How to Find Source of an Open dead circuits end of a Run with Ideal Circuit Tracers
    Duration: 1:09.




Rating: 0.00 / 10 (0 Vote cast)

Leave Comment

characters left: