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VCA Probably a straightforward build: one op-amp, four transistors and some example modules schematic start, and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a result, the Commercial Contributor in connection with double feed through strain relief, for 5 times 0.25 mm² wires, reinforced insulation.

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