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Thread: Current in 16f84
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face BY : Richard Prosser email (remove spam text)



Some darlingtons actually include a built-in resistor from base-emitter to
counteract this. You're generally safer though to always place a  resisistor
b-e if only to assist in those cases where something goes wrong & the
transistor gets leaky. This is one of the things us "old hands" look for
when checking the designs of new engineers. Several times I've had to repair
equipment where no resistor was fitted and the problem was a slightly leaky
transistor - which would've been OK with even a 1Meg pull down.
With a darlington, any leakage will be more significant due to the higher
gain.

Richard P

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