05-08-2011, 01:33 PM
(25-07-2011, 08:21 AM)DODGERN Wrote: Yes, I would agree with David, a signal injector is ideal and for a relatively small outlay, you can fault find stage by stage.
If you are into construction, here is a suitable project.
http://www.zen22142.zen.co.uk/Circuits/T..._trace.htm
Roger.
That's a great link Roger, with lots of useful projects - well over 200 in fact, including 23 test gear circuits and 37 power supply projects. A year or so ago I made a zener diode tester from a circuit I found there, which works well. It runs of two PP3 9V batteries in series, and tests zeners up to 51 Volts. I used one of those cheap Chinese digital voltmeter module, for the meter, built the circuit on stripboard and made a little oak box in which to house it, from a bit of scrap flooring fished out of a skip. The front panel was a scrap of double sided SRBP printed circuit board.
I've attached a few pics - one of the inside, one showing the maximum voltage of 52V, another with a 5V1 Zener on test. Hope it's of interest - if nothing else, it shows that useful homebrew test gear can be made for next to nothing.
David
