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BackPower MK uses a CA3080 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, depending mainly on whether 8+6 pins + hardware fits on.
- Phoenix H male (A series layout), mates.
- 1766822 12A 630V Generic Phoenix Contact connector.
- 55x7.6mm^2, drill diamater 1.3mm, pad diameter 3mm.
- (end 2.811 -1.04 (end 1.89 -1.04 (end 2.251.