Hi, I have now received my CM15A from USA and are going to convert it to 220V.
I can either use a external transformer or exchange the allready soldered transformer on the board !
I would prefer to change the transformer on the board but I am affraid that the opto couplers will be damaged.
Any advice ?
I think an external 220:120V step-down transformer with a bypass cap is safest. Otherwise, there are a few other components that you will need to change.
There's a schematic at
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