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Originally Posted by whcirobotics
(1) BASE
==> It is where some kind of signal, or small current is entered(microphone for example)
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yes.
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(2) COLLECTOR
==> It is connected to a power source/supply, like a battery or power outlet
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If it's an NPN, yes. If it's a PNP, + is connected to the emitter.
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(3) EMITTER
==> It is always the output, the amplified current
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In an emitter-follower circuit, the output load is in the emitter leg.
In a collector-follower circuit, the output load is in the collector leg.
An emitter follower has low voltage gain.
A collector-follower has both voltage and current gain.
If you're trying to drive a speaker (output load) with a microphone (input signal), you're probably gonna need both voltage and current gain.
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can a EMITTER only be a output? always?
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No. The output load can be in the emitter leg (emitter follower, aka common collector) OR the collector leg (collector follower, aka common emitter).
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some websites were saying collector can also be?
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correct.