Hi, I want to convert my existing PCB from 220 to 110 volts.
For 110 VAC I have done the following.
1. 110 volt T1 transformer with the same footprint would be a special and costly so I have eliminated the need for it.( It will also reduce the weight of the unit)
2. I am installing a terminal block at BD1+- and applying 12 VDC to it.
3. I am removing ZD4 and R5.
3.1 I then short out R5 and this completes the low voltage circuit.
3.2 I can then check that the low voltage circuit is functioning properly before connecting the high voltage.
4. I can then connect 110 VAC to CN1.
4.1 The question is what components do I need to change on the high voltage side to get the correct current at CN2 and CN3.
4.2 I think I need to change the resistor value at R1 and R4 to get the same VA as 220 VAC but do I need to change others.?