The output, when used as a buffer, will theoretically be identical to the input signal. The output of the op amp can easily drive 1000 ohms or more. It might be used if the input signal to the op amp was coming from a source which could supply almost no current. The input impedance of an op amp is extremely high (on the order of 10 12 ohms). The circuit below shows a simple buffer circuit. The diagram below shows the schematic symbol for an op amp. They can also be used with a single ended supply (no negative voltage) in head units and other such equipment that have no switching power supply. Most op amp circuits used in audio use a ☑5 volt power supply (especially when the audio equipment has a switching power supply). None of the power supply connections are shown. The following section is an attempt to give you a basic understanding of just a few applications. There are a bazillion (technical term) applications for op amps. If the signal is fed into the negative (inverting) input, the output will be 180 degrees out of phase when compared to the input. A signal fed into the positive (non_inverting) input will produce an output signal which is in phase with the input.
They typically have 2 inputs, a positive (non_inverting) input and a negative (inverting) input. Operational amplifiers (op amps) were originally used for mathematical operations in 'analog' computers.
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