On Sat, 30 Sep 2017 01:12:32 -0500
Michael J. Mahon  wrote:


> For heating systems with lags of hours, it is important to anticipate
> a future need for heat as well as anticipating the considerable
> overshoot that will occur after the heat is switched off. I found
> this simple PWM approach quite effective.
>
PWM usually uses a frequency somewhat greater than 0.000023 Hz.  :-)

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