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AS A2

The Voltage Gain is One

• But the current and power gain can both be very large.
• Ideal Device: Vout = Vin
• Real Life Device: Vout = Vin - 0.7
• The input resistance is very large.
• The output resistance is small.
• The output is well isolated from the input.

• B = BASE.
• C = COLLECTOR.
• E = EMITTER.
• The base input resistor is not always needed.
• Transistors in this configuration are usually controlling quite large currents so they will be bolted to a heat sink.
• This circuit can be used in push-pull amplifiers (MOSFETS are usually preferred). An NPN and a PNP transistor must be used.

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