Magnetic Chuck Control Circuit Wanted

markba633csi said:
Very nice John- so the parallel ptc group you have now is about 5 ohm cold. If you had to order them again I'm guessing you would order a lower resistance value.
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That's quite an "if" :) Would if I could
-but-
It took me a good deal of searching to even find any suitable PTCs. Nearly all of them have a very sharp cutoff, and are intended as thermal switches. Finally went to Alibaba, where nearly all of the vendors wanted to sell in quantities like 5000 units. I thought I was very fortunate to find the one I did ... minimum order quantity 50.

Having used 4 for my mag/demag, I still have lots left to give away.
 
I like Alibaba (and Aliexpress) too, some good bargains there if you don't mind a bit of a wait
 
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