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>> No.1608843 [View]
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1608843

>>1608730
An arduino basically is a microcontroller, albeit a pretty inefficient one. Not that it isn't a good way of going about this project, but if you're apprehensive about using an arduino, I doubt you'd prefer using a barebones avr.
I'd use an R2R resistor ladder DAC which feeds a normal triangle wave comparator PWM circuit. No buffering needed either, since the output will be going into a high-impedance comparator anyhow. So that's like 2 ICs, assuming you make the triangle wave oscillator with the second comparator and your resistors are in a single-package network.



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