Author Topic: System 80 Driver Board / Gottlieb Q's  (Read 1727 times)

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Offline Retropin

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Re: System 80 Driver Board / Gottlieb Q's
« Reply #30 on: May 04, 2009, 05:01:46 PM »
You dont need to go splashing big bucks on a Fluke just to test a simple transistor. - Also just cos its a DMM and nice and modern doesnt also mean that it makes your life simpler. I hate DMM's unless reading a voltage as the correction factor due to internal resistance is minimal.
 Go spend $40 on an ANALOGUE meter. Set it to Ohms. Put leads on E and C on your transistor - any reading and its stuffed.

E to B should read high with leads one way and low with them swapped around - same with C to B.

In other words you have a "gate" that only allows a flow of electrons one way, if you get the same readings with the indicator sweep on the meter with red and black leads swapped then your "gate" is stuffed and so is your transistor.

Its by far the easiest way i know to test a transistor. DMM's are a pain in the butt