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See PDF at https://raw.githubusercontent.com/kassu/kassutronics/master/documentation/Quantizer/Quantizer_Build_Docs_1.1A.pdf for explanation about PWM smoothing; essentially a 4-stage RC network but with an eye towards doing it all in one module with a 7-segment display with LED backlight 160x104 RS-232 I2C or SPI LCD graphical display 480x272 16-bit colour with LED backlight 240x128 LCD display 320x340 RS-232 I2C or SPI LCD graphical display 480x272 16-bit colour with LED backlight 160x104 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip160-7e.pdf LCD-graphical display with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, Memory Protection.

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