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Old 16th May 2010, 10:21 am   #2
Herald1360's Avatar
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 14,775
Default Re: Testing transistors - analogue version

Don't forget the wet finger check for a bit of gain:

Connect AVO on ohms x 100 to collector and emitter (remember lead polarity is reversed on ohms), lick fingers, connect thumb to collector, forefinger to base (or vice versa), look for noticeable increse in meter deflection.

For a quick sanity check, repeat wet finger bit with just the meter and check that deflection is now less than with transistor in circuit.
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