Measurement and testing

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Transistor Tester
Transistor Tester
September 4, 2010

This circuit can measure both small signal hfe and DC current gain hFE of a low to medium power power transistor [more]

EMF Probe Version 2
EMF Probe Version 2
September 4, 2010

An electromagnetic field probe designed to detect changing electric and magnetic fields [more]

Low Frequency Oscillator
Low Frequency Oscillator
September 4, 2010

A low frequency test oscillator for testing tone controls and experimenting [more]

Coil Coupled Operation Metal Detector
Coil Coupled Operation Metal Detector
September 4, 2010

A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector [more]

Beat Balance Metal Detector
Beat Balance Metal Detector
September 4, 2010

A Beat Balance Metal Detector made from discrete components [more]

Signal Tracer and Injector
Signal Tracer and Injector
September 4, 2010

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 [more]

Bench Amplifier
Bench Amplifier
September 4, 2010

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. [more]

Two Simple Crystal Test Circuits
Two Simple Crystal Test Circuits
September 4, 2010

Two simple test circuits to check operation of quartz crystals. [more]

Sine Wave Generator
Sine Wave Generator
September 4, 2010

A classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps [more]

Connection Tester
Connection Tester
September 4, 2010

A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections. [more]

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