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Originally Posted by unregistered
jeez, I'd have bet the moon that such could not be done with PWM and a rad
- new lesson every day
how about with different heat loads ?
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I haven't tested it with varying heat loads yet, I would imagine that would trigger an instability or small oscillation. It is a matter of tuning the circuit to minimise this.
It is unfortunate, the PWM is tunable in the sense that I can adjust the sensitivity of the response by adjusting the modulating triangle waves amplitude, but this also changes the frequency - the most stable setting is also the most irritating tone.
The good regulation surprises me too, I designed the circuit to be in principle accurate but it is always a bonus when it works better than expected.