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BackRare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some example modules main 5a4e89eea6 Add position for resistor between coarse and +12V, value unknown Add position for resistor between coarse and +12V, value unknown Add position for resistor between coarse and +12V, value unknown c5e8dbdd1f Align panel to PSU PCB (will affect choice of 9 mm vertical board mount OR: | | R15, R20, R22 | 3 | 4.7k | Resistor | | | R25, R27, R29 | 2 | 47k | Resistor | | | | R14 | 1 nF | Unpolarized capacitor | | R14 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>