Electronics Handbook/Components/Amplifier

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Transformer

\frac{V_{o}}{V_{i}} = \frac{N_{2}}{N_{1}}

When $N_{2} > N_{1} V_{o} > V_{i}$ Transformer acts as Voltage Amplifier

Transistor

\frac{V_{o}}{V_{i}} = \frac{R_{2}}{R_{1}}

When $R_{2} > R_{1} V_{o} > V_{i}$ Transistor acts as Voltage Amplifier

Op Amp

\frac{V_{o}}{V_{i}} = 1 + \frac{R_{2}}{R_{1}}

When $R_{2} > R_{1} V_{o} > V_{i}$ Transistor acts as Voltage Amplifier

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