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Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 1 uF | Polarized capacitor | Tayda | A-3588 | \** Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount module ACDC-Converter, Murata, 5W, ClassB, https://www.murata.com/products/productdata/8809982558238/KAC-BAC05.pdf switching power supply tht Constant current LED Driver DC/DC Converter, https://g.recomcdn.com/media/Datasheet/pdf/.fYUQjOlW/.t2a80a771bdbb0ef300f7/Datasheet-93/RCD-24.pdf DCDC-Converter, 30W POE, Silvertel, 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 0.5W = 1/2W, length*diameter=9*3.2mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf Resistor Axial_DIN0207 series Axial Horizontal pin pitch 30.48mm 4W length 20mm width 6.4mm Capacitor C, Rect series, Radial, pin pitch=19.10mm, , diameter=21.8mm, Bourns, 2100, http://www.bourns.com/docs/Product-Datasheets/2100_series.pdf?sfvrsn=3 L_Toroid Horizontal series Radial pin pitch 10.00mm diameter 18mm height 35.5mm Non-Polar Electrolytic Capacitor C, Rect series, Radial, pin pitch=9.00mm, 2W, length*width=13.0*4.0mm^2, http://www.produktinfo.conrad.com/datenblaetter/425000-449999/443860-da-01-de-METALLBAND_WIDERSTAND_0_1_OHM_5W_5Pr.pdf Resistor Box series Radial pin pitch 27.94mm 5W length 25mm width 6.4mm Capacitor C, Rect series, Radial, pin pitch=14.61mm, , diameter=21mm, Vishay, IHB-2, http://www.vishay.com/docs/34015/ihb.pdf Inductor Radial series Radial pin pitch 25mm length 17mm diameter 6mm Resistor, Axial_DIN0918 series, Axial, Horizontal, pin pitch=100mm, , length*diameter=93*26mm^2, Electrolytic Capacitor, , http://www.vishay.com/docs/42037/53d.pdf CP Axial series Axial Vertical pin pitch 3.00mm diameter 7.2mm MuRATA 1700 Inductor, Radial series, Radial, pin pitch=10.00mm, diameter=26mm, height=45mm, Electrolytic Capacitor, , http://www.kemet.com/Lists/ProductCatalog/Attachments/424/KEM_AC102.pdf CP Axial series Axial Vertical pin pitch 2.54mm size 20.78x6.5mm^2 drill 1.1mm pad 2.2mm Terminal Block WAGO 804-310 45Degree pitch 5mm size 40x9.8mm^2 drill 1.3mm pad 2.6mm.

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