8 Apr
2012
8 Apr
'12
9:44 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
I have breadboarded the circuit above and tested the 4 Darlington
Transistors. The one that was showing slightly different values to the rest
with my diode test turned out to switch on the bulb regardless of whether
the resistor was there or not. The others worked as they should. So I will
now look to source a replacement.
Thanks for the help with the test circuit!
Regards
Rob