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Goophene: Hypersensitive Graphene Sensors
A Preamplifier for Smartphone Oscilloscopes
In the power supply circuit you used 33microfarad capacitors and while it the parts description you written 22microfarad. Which one to use? I am confused. and to which pin of the lm324 ic ..the minus 8V nd ground supply is to connected?
OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator