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R-core transformer help
I recently bought a r-core 30w dual 12v transformer for a pre amplifier board that has dual 12v or 18v in. On input side there are four wires. Black and which I will be using for the 115v and red and yellow green for the 230v. Question is what wire do I use for the ground or do I just isolate the red and yellow green from shorting anything out and ground to the chassis from the iec input? On the secondary’s there are two blue and two brown wires. On the pre amplifier board it is dual 12v-0-12 or 18v-0-18. Question is what wire do I use for 0? I’ve seen it done one wire each for + and – and the other two wires for 0 i believe but I want to be very sure I wire everything correctly so that’s why I’m asking. Any help would be greatly appreciated
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