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TIP 42 test cct.

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Well-Known Member
With no resistor to limit the collector current, this transistor could draw as much as 2.8 amps, dissipating 25 watts until it burns up unless you have a big heat sink on it.


New Member
thx alot for the test circuit. Well, the tip42 appears to be working fine in the test circuit, i actually get a voltage reading coming fromt he collector. But, when i put it into my board for this schematic (see below), i get .3v where there should supposedly be some voltage more or less 8-9v i guess. Am i wrong or...

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