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Three legs on a transistor are represented by these letters

E Emitter =you connect your input depending on type of your transisitor neg or pos

B Base = you connect control input again depends on type

C collector = here comes your amplified output

there are 2 types of transistors PNP and NPN

there is no current flow from emitter to collector when ther is no control input at the base. a very small opposite current to the emitter polarity make current flow multiplied by the amplification factor of each transistor.

if you use a sound frequency input at the base you have amplified sound output at collector if you just use dc you have amplified dc current output.

some transistors leak current to kill that unwanted flow through collector use a small resister from emitter to base.

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12y ago

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