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Op-Amp Buffer - Tufts University
https://www.eecs.tufts.edu/~dsculley/tutorial/opamps/opamps5.html#:~:text=The%20circuit%20is%20surprisingly%20simple.%20Op-Amp%20Buffer%20Here%2C,arrangement%20is%20called%20an%20Op-Amp%20Follower%2C%20or%20Buffer.
Op-Amp Buffer - Tufts University
https://www.eecs.tufts.edu/~dsculley/tutorial/opamps/opamps5.html
Op-Amp Buffer. So let's look at that third amplifier challenge problem -- design a non-inverting amplifier with a gain of exactly 1. Now, we could have done it with two inverting amplifiers, but there's a better way. We calculate gain for a non …
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.
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).
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