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BackCA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, mostly down to PCB edge 9.12mm.
- 0.830896 vertex 7.3432 -0.499373.
- DFS "Flat", see http://www.vishay.com/docs/88874/dfl15005.pdf SMD diode bridge.