8 Apr
2012
8 Apr
'12
2:08 a.m.
The TIP125 are Darlington Transistors, you can't
test them very good with
your Diode Tester.
Better use a small battery (between4 and 10 Volts) a samll lightbulb from
the collector to the negative pole from the battery, connect the emitter
to
the positive pole and a resistor with approx
10-20Kohms from the basis to
the negative pole. The light bulb should light up then, w/o the resistor
not.
Regards,
Holm
Holm,
Thanks for the procedure for testing the Darlington transistors. One thing I
wanted to check though. You say that the collector should be connected to
the negative pole of the battery, I thought that, conventionally at least,
collectors were connected to the more positive side and emitters to the
negative?
I have done a drawing to illustrate what I understood from your email (I
used an LED symbol for the light bulb because I did not have a simple bulb
symbol). You can view it here:
https://skydrive.live.com/redir.aspx?cid=fc758a5a91b91301&resid=FC758A5…
1301!602&parid=FC758A5A91B91301!143&authkey=!AO-F3bI24frPXbg
Let me know if that is correct.
Thanks
Rob