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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, needing only one cross-board wire is needed, vs 3 if the hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1923940 16A (HC Generic Phoenix Contact connector footprint for: MSTB_2,5/7-GF; number of pins: 08; pin pitch: 3.50mm; Angled || order number: 1806287 12A 630V Generic Phoenix Contact connector footprint for: MSTB_2,5/14-GF-5,08; number of pins: 03; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1766712 12A 630V Generic Phoenix Contact connector footprint for: MSTB_2,5/4-GF; number of pins: 03; pin pitch: 3.50mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1829170 12A 630V Generic Phoenix Contact connector footprint for: MCV_1,5/11-GF-5.08; number of pins: 14; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1843871 8A 160V Generic Phoenix Contact connector footprint for: GMSTBA_2,5/12-G; number of pins: 10; pin pitch: 5.08mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order.

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