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If going digital ** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the MCP4922 DAC (others may work). Probably can build our own based on SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W single output DC/DC, http://power.murata.com/data/power/ncl/kdc_cre1.pdf Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78E-0.5, SIP-3, pitch 2.54mm, package size 11.5x8.5x17.5mm^3, https://www.recom-power.com/pdf/Innoline/R-78Bxx-2.0.pdf dc-dc recom buck sip-3 pitch 2.54mm length 5.2mm diameter 2.7mm Diode, DO-41_SOD81 series, Axial, Horizontal, pin pitch=43mm, , length*diameter=37*13mm^2, Electrolytic Capacitor, , http://www.kemet.com/Lists/ProductCatalog/Attachments/424/KEM_AC102.pdf CP Axial series Axial Horizontal pin pitch 60.96mm 11W length 50mm.

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