Fundamental Physics/Electricity/Electric circuits/Transistor circuit

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With the right connection, by connecting transistor with resistor(s) Transistor can acts as


Current amplifier[edit | edit source]

Provided that, transistor should be turned ON with biased voltage at the base must be greater than diode's break over voltage

.

Voltage amplifier[edit | edit source]

Non inverting voltage amplifier[edit | edit source]

With

and . . Transistor acts as Switch OFF (open circuit)
and . . Transistor acts as Switch ON (close circuit)


With

and . . Transistor acts as Non inverting amplifier

Inverting voltage amplifier[edit | edit source]

Transistor amplifier blocked emitor.svg


With

and . . Transistor acts as Switch ON (close circuit)
and . . Transistor acts as Switch OFF (open circuit)


With

and . . Transistor acts as Inverting amplifier

An electronics switch[edit | edit source]

Transistor is switch On when
Transistor is switch Off when

A buffer[edit | edit source]