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Build A Cheap DIY Signal Tracer / Injector Pen Useful For Electronics Fault Finding

In this video clip I chose to build an economical Audio Signal Injector/ Tracer Pen making use of some usual circuits I discovered on the net … That should be nice very easy and also affordable to do yeah? I imply, actually, exactly how hard can this be???

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Songs making a cameo look in this video: David And The Giants – Ten Miles High

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