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Electrical Engineering - Circuits - Darlington Configuration
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[QUOTE="rude man, post: 4548344, member: 350494"] Your numbers are certainly approximately correct. For an emitter follower the voltage gain is always < 1. Your current gain seems a bit low, but it might be spot-on. I personally don't use models and assume the base voltage does not change with input voltage, in which case the current gain = beta = 8000. So your current gain is certainly not high. (You on the other hand are not allowed to make that assumption! :frown: ) In real lfe this circuit would never work. Beta is a very unstable (with temperature) and non-repeatable parameter for any transistor from unit to unit, so the emitter voltage would vary all over the place. Typically, circuits are designed assuming beta = infinity Anyway, you were right to assume the Darlington is a single transistor with Vbe ~ 1.6V and beta = 8000. [/QUOTE]
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Electrical Engineering - Circuits - Darlington Configuration
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