The tester uses just two "rail-rail" op amps and 7 resistors and two capacitors (one for power supply decoupling). The "setPwmFrequency(int pin, int divisor)" function in the sketch sets the prescaler for the chosen timer up automatically as required.įinally - the electronic circuit: three main sections: filter, buffer and difference amplifier These give PWM frequencies of 31,250Hz 3906Hz 488Hz 122Hz 30.5 Hz Įither 31kHz or 3.9kHz work well with the filter values shown. The base frequency for Timer1 is 31250 Hz, and divisors of 1, 8, 64, 256, and 1024 are available I've chosen to use pin 9 (Timer1) to avoid this. We generally avoid changing Timer0 because of the problems it raises with the timing functions.
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