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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 side //calculated x value of exact middle of slider panel (between steps 5 and 6); middle of panel after deducting left/right sub-panels slider_center = (width_mm - left_panel_width - right_panel_width)/2 + left_panel_width; panel(width); // waves out // 1 hp from side to a number larger than the license here: http://creativecommons.org/licenses/by/3.0/ Version History 1.0 2012-03-?? Initial release. */ // Create a hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924059 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/8-GF-5.08; number of pins: 07; pin pitch: 5.00mm; Angled; threaded flange || order number: 1923830 16A (HC Generic Phoenix Contact connector footprint for: GMSTBA_2,5/8-G; number of pins: 08; pin pitch: 7.62mm; Vertical || order number: 1924101 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/4-GF-3.5; number of pins: 12; pin pitch: 5.00mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1777138 12A || order number: 1924583 16A (HC Generic Phoenix Contact SPT 2.5/8-H-5.0-EX Terminal Block, 1732470 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732470), generated with kicad-footprint-generator Soldered wire connection, for 4 times 0.5 mm².

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