Buffer

The buffer is a single-input device which has a gain of 1, mirroring the input at the output. It has value for impedance matching and for isolation of the input and output.

How do you make one?


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Making a Buffer

The basic emitter follower can be used as a buffer.

An op-amp voltage follower can serve as a buffer.

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Inverting Buffer

The inverting buffer is a single-input device which produces the state opposite the input. If the input is high, the output is low and vice versa.

This device is commonly referred to as just an inverter.

How do you make one?
IC7404 hex inverter


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Making an Inverting Buffer

A transistor switch with collector resistor can serve as an inverting buffer.

An op-amp inverting amplifier with a gain of one serves as an inverting buffer.

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IC 7404 Inverting Buffers

The 7404, 74H04, 74S04, 74S04A, 74LS04 share this geometry and function. There are a number of other variations on inverter chips.

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