I started this little project nearly two years ago and laid it aside, and
nearly forgot all my original reasoning. I just remembered it, because I
just now reset the timing module.

It's my aim to determine and eliminate every variable I can think of so I
can get back into electrification. One of those variables is polarity
reversal timing, trying to maintain some comfort while still trying to use
DC at as slow a rate as possible, not into the hertz ranges.

It was really easy just now to slide one little microswitch and turn one
little analog pot to go from 5 minute reversal to 15 second reversal.

This relay will even go to 10 hertz, but that would be noisy and wear it out
too soon.

Daddybob