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Op-Amp Buffer - Tufts University
https://www.eecs.tufts.edu/~dsculley/tutorial/opamps/opamps5.html
This arrangement is called an Op-Amp Follower, or Buffer. has an output that exactly mirrors the input (assuming it's within range of the voltage rails), so it looks kind of useless at first. However, the buffer is an extremely useful circuit, since it helps to solve many impedance issues. The input impedance of the op-amp buffer is very high:
Op-Amp Audio: Realizing High Performance: Buffers (Part …
https://www.electronicdesign.com/technologies/analog/article/21774018/opamp-audio-realizing-high-performance-buffers-part-i
This is done by packaging a simple, four-lead IC buffer like the BUF04, and a highly linear IC op amp such as the AD744, together as a (isolated) two-chip solution in a common package. Other...
Buffer Audio with an Op-Amp - Page 1
https://www.eevblog.com/forum/projects/buffer-audio-with-an-op-amp/
It goes within about a volt of each rail and is specified down to +/- 2V, so on a single 5V rail you could get an output from 1 to 4V. It's about $1 in single quantity, so not incredibly cheap ($0.50 each amplifier, it's a dual op amp), but has decent characteristics for audio (5-9 nV/rtHz noise, 0.0005% THD, 50mA max output current).
How to Buffer an Op-Amp Output for Higher Current, Part …
https://www.allaboutcircuits.com/technical-articles/how-to-buffer-an-op-amp-output-for-higher-current-part-2/
With a negative output voltage, current flows “out of” the ground node, through the load, and “into” the op-amp, such that the op-amp is now sinking current. Thus, to support signals that extend above and below ground, we need an output-current …
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