Dave Goldsmith
New Member
Hi, I'm trying to design a circuit that I can plug into the wall here in the us (110VAC) and get 12V out that switches polarity every 3 minutes. Also, I need the circuit to have a tunable range of 4A to 9A output, with the constant 12V. I have seen some ideas that involve using a 555 timer for the timing, and I'm thinking an H-Bridge can be used for the polarity switch, but I'm worried that my current requirements will affect the operation of the 555. Any ideas how to design as simply and cheaply as possible would be greatly appreciated.
Thanks,
Thanks,