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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 main 5a4e89eea6 Add position for resistor between coarse and +12V, value unknown Align panel to PSU PCB (will affect choice of 9 mm vertical board mount module ACDC-Converter, 10W, HiLink, HLK-5Mxx, (http://h.hlktech.com/download/ACDC%E7%94%B5%E6%BA%90%E6%A8%A1%E5%9D%975W%E7%B3%BB%E5%88%97/1/%E6%B5%B7%E5%87%8C%E7%A7%915W%E7%B3%BB%E5%88%97%E7%94%B5%E6%BA%90%E6%A8%A1%E5%9D%97%E8%A7%84%E6%A0%BC%E4%B9%A6V2.8.pdf ACDC-Converter 5W Meanwell IRM-05 ACDC-Converter 10W Meanwell IRM-10 ACDC-Converter, 20W, Meanwell, IRM-20, THT http://www.meanwell.com/webapp/product/search.aspx?prod=IRM-20 ACDC-Converter 20W Meanwell IRM-20 ACDC-Converter, 50-60W, Meanwell, IRM-60, THT https://www.meanwellusa.com/productPdf.aspx?i=687 recom power ac dc Recom RAC20-xxDK https://recom-power.com/pdf/Powerline_AC-DC/RAC20-K.pdf#page=6 Rev. 6/2020 ACDC-Converter, TRACO, TMG Series 15 https://www.tracopower.com/products/tmg.pdf ACDC-Converter TRACO TMLM 05 ACDC-Converter, TRACO TMLM 10 and TMLM 20 Vigortronix VTX-214-010-xxx serie of ACDC converter, http://www.vigortronix.com/10WattACDCPCBPowerModule.aspx Vigortronix VTX-214-010-xxx serie of ACDC converter DCDC-Converter, Artesyn, ATA Series, 3W Single and Dual Output, 1500VDC Isolation, 19.0x17.0x8.7mm https://www.xppower.com/Portals/0/pdfs/SF_ISU02.pdf DCDC SMD XP POWER ISU02 XP_POWER ITQxxxxS-H, SIP, (https://www.xppower.com/pdfs/SF_ITQ.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 52991-0208, 20 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039289068_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 40 Pin (http://www.issi.com/WW/pdf/31FL3736.pdf#page=28), generated with kicad-footprint-generator JST SH series connector, 502386-0470 (http://www.molex.com/pdm_docs/sd/5023860270_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-110-02-xxx-DV-A, 10 Pins per row (https://www.molex.com/pdm_docs/sd/022057045_sd.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/12-H-5.0 Terminal Block, 1719215 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719215), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MSTB_2,5/9-GF; number of pins: 13.

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