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Tools and measuring - list of circuit diagrams
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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: 657 
This circuit is the way of measuring the relative intensities of different Infra red light sources.
author: visits: 570 
A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections
author: Andy Collinson visits: 457
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