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One 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 example modules Latest commits for file Schematics/MK_VCO_RADIO_SHAEK.diy PSU/Synth Mages Power Word Stun.kicad_prl | 4 .../precadsr_Gerbers/precadsr-Edge_Cuts.gbr | 4 | | | | | | | | | | J2 | 1 | 1 | Conn_01x02 | SIP socket, 2.54 mm, 1x10 Pin socket, 2.54 mm, 1x4 | | | J9 | 1 | Conn_01x04 | Pin header, 2.54 mm, 1x4 Light emitting diode, 5 mm x 20 mm, Slotted Cap, horizontal, 500 VAC 4W/16A (VDE), 600V 30A (UL/CSA), order numbers: 0031.2510 (0031.2500 + 0031.2321), http://www.schurter.ch/bundles/snceschurter/epim/_ProdPool_/newDS/en/typ_FUP.pdf Fuseholder 6.3x32mm horizontal closed Maxi APX ATX Automotive Blade Fuse Clip Holder Littelfuse NANO2 holder, https://www.littelfuse.com/~/media/electronics/datasheets/fuses/littelfuse_fuse_154_154t_154l_154tl_datasheet.pdf.pdf Littelfuse NANO2 holder, https://www.littelfuse.com/~/media/electronics/datasheets/fuses/littelfuse_fuse_157_datasheet.pdf.pdf Fuse, Fuseholder, TR5, Littelfuse/Wickmann, No. 460, No560, https://www.littelfuse.com/~/media/electronics/datasheets/fuse_holders/littelfuse_fuse_holder_559_560_datasheet.pdf.pdf Fuse Fuseholder TR5 Littelfuse/Wickmann No. 460 No560 Heatsink, 35mm x 26mm, 1x Fixation 3mm, Fischer SK486-35 Heatsink, 38x38mm, Spring Fixation, diagonal, Heatsink, 62 x 40mm, 2x 3mm Drills, Heatsink, 125x35x50mm, 3 fixation holes.

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