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Tools and measuring - list of circuit diagrams
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This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz
author: visits: 1202 
A function generator using the ICL8038 integrated circuit. Is has four ranges and capable of sine, square and triangle outputs.
author: Andy Collinson visits: 928 
This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing
author: visits: 848 
A Beat Balance Metal Detector made from discrete components
author: Rev Thomas Scarborough visits: 744 
Two simple test circuits to check operation of quartz crystals
author: Andy Collinson visits: 703 
A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer
author: Andy Collinson visits: 700 
A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC's
author: Andy Collinson visits: 693 
A small 325mW amplifier with a voltage gain of 200 that can be used as a bench amplifier, signal tracer or used to amplify the output from personal radios, etc
author: Andy Collinson visits: 673 
Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC
author: Andy Collinson and Aleksandar Dakic visits: 667 
This circuit provides an easy yet reliable way to detect the intensity of a.c. (or e.l.f.) fields around the home or workplace
author: Rev. Thomas Scarborough visits: 648
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