Uploaded September 2025 | Updated September 2026, 2 weeks ago

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I ended up with this custom op amp circuit in a Phase 90 effect case I got from someone years ago.
When I took it apart there was a FRAP label inside, which I had never heard of so I started investigating what a Flat Response Audio Pickup was.

db magazine article about FRAP, Dec 1979 page 47
archive.org/details/DB_Magazine_1979_12/page/n48/mode/1up

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