Low resistance continuity tester

Posted on Jun 5, 2012

This tester can be used to check IC printed circuit boards. Two 4 K resistors and the transistors connected to them prevent current flow through the operational amplifier until the probe circuit is completed

Low resistance continuity tester
Click here to download the full size of the above Circuit.

The zener diode in series with the operational amplifier output prevents audio oscillator operation until the positive output of the operational amplifier has sufficient amplitude.

Leave Comment

characters left:

New Circuits



Popular Circuits

Digital Altimeter Circuit
Logic Circuits Vs Transistor Power Circuits
Scoring Game Circuit
12/24/48 V D.C. Tester
Digital AC Voltmeter
Ultra-Simple Mono-in Panning Mixer
Detecting an ultrasonic beacon