Kevin, "Ole Bob" sold a number of constant voltage reversible polarity machines about two years ago. I might even have a shemactic left around here somewhere. The develpoment unit had a relay but it lasted for only a few runs then I went to all solid state using a motor control IC for the output.
"Ole Bob" Kevin wrote, > A while back I came to the same conclusion re cathode area and > plate-out. After having little improvement with going from large area > stainless cathodes to 1/16" diameter stainless wire cathodes, toyed > with borrowing an idea from the Microwater people - cocoon the > cathode(s) in a membrane such as chamois, that allows current flow but > restricts access of silver ions to the cathode surface. However I > believe the best solution is to borrow another idea that a CS vendor > (can't recall who) uses - reverse the polarity regularly. I think that > vendor's machine switched polarity about once a minute. An adjustable > timer is preferable, as optimum switching period probably will vary > depending on the particular setup used. It neatly solves a number of > issues. No need to clean the cathode surfaces of oxide buildup. No > need to filter the brew. No need to worry about how much silver is > lost via plate-out - should be negligible. The disadvantages are > increased complexity and cost, and the need to ensure that all > electrodes are silver. To me, benefits outweigh costs. Any electronics > enthusiasts on the list willing to come up with a DIY circuit design?
