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BackOTA, 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 integer pseudo-origin, remove testing text, decrease title label font so we don't need a hole, set this to a dual or quad would add very little cost even without 1v/oct, could be done with a 7-segment display with LED backlight 160x104 RS-232 I2C or SPI LCD 4x10 character 3.3V VDD I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip320-8e.pdf LCD display 320x340 RS-232 I2C or SPI 3 Line 12 character wide alpha numeric LCD LCD-graphical display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see http://www.kodenshi.co.jp/products/pdf/sensor/photointerrupter_ref/SG-105.pdf package for Vishay CNY70 refective photo coupler IR Receiver Vishay TSOP-xxxx, MINIMOLD package, see https://www.vishay.com/docs/82669/tsop32s40f.pdf IR Receiver Vishay TSOP-xxxx, CAST package, see https://www.vishay.com/docs/82669/tsop32s40f.pdf IR Receiver Vishay TSOP-xxxx, MINIMOLD.
- Electronics 97730356332 (https://katalog.we-online.com/em/datasheet/97730356332.pdf), generated with kicad-footprint-generator.
- (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732551), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board.