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Tools and measuring - list of circuit diagrams
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A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections
author: Andy Collinson visits: 127 
A Coil Coupled Operation Metal Detector made from readily obtainable components and using an ordinary medium receiver as a detector
author: Rev. Thomas Scaraborough visits: 126 
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: 119 
Two simple test circuits to check operation of quartz crystals
author: Andy Collinson visits: 119
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