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I really should be doing other things, but I can't resist doing another quick piece of DIY Test Equipment. Again I'm going to post it here in my blog. I haven't worked it up into a polished piece of equipment - it isn't even really finished - instead I'm piecing together a design that you could take 'as is' and finish nicely or use the building blocks for something quite different.   This time it's a diode tester. Operation is quite simple: I'm going to pass a current through the diode ...