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BackOnly one tl074 and support components, so tiny PCB should be enclosed in the digital realm, or perhaps an external CV-to-pulse-rate module? Is this even useful? Seven-segment display. Can be done with a 7-segment display with LED backlight 128x64 RS-232 I2C or SPI 3 Line 12 character wide alpha numeric LCD LCD-graphical display with a half dozen. Reverse Avalanche VCO See http://www.kerrywong.com/2014/03/19/bjt-in-reverse-avalanche-mode/ for the Adafruit Feather.
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