Quote:
Originally Posted by Radio Wrangler
Remember, it's supposed to be fun. If it stops being fun, stop doing it.
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I agree with that. All sorts of tricks can be used to make "amplifiers" a good old one is a CMOS logic inverter gate with a 1M resistor from its input to its output.
One I saw recently, quite creative I think, using a MAX232CPE serial driver IC, powered from 5V to make an audio amp. It uses the usual 1M for a feedback resistor around an inverter to turn a gate into an analog amp. Because of the flying capacitor step up voltage to +/- 8V it can produce a 14.5V peak to peak output signal. It was published in Silicon Chip page 99, Oct 2019, designed by Ariel Benvenuto from Argentina.