Ol Bob has a circuit he has already drawn up that will do what your after. Maybe he will share it with you.

At 09:19 PM 8/9/03, you wrote:
David,
There are two possibilities for the polarity switch:  1.  Every two
minutes,  or,  2.  Every one minute.
I'd like to be able to do either of these with one device, but if not
that's okay too.  I have heard it said that more frequency gives smaller
particles, but then for saturating ceramic filters it may be the larger
particles that are better.
Reid


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