I'm building up a fairly beefy PSU using 6 toroidal transformers. They are rated at 230v 120VA (20V secondaries).
Two of the transformers are going to be connected straight to the mains and the secondaries straight to bridge rectifiers to give me approx 30-0-30v for a couple of variable supplies and to feed some opamp circuits. Another couple are going to feed a bunch of linear regulators to give me the usual 5v, 8v, 12v, 15v, 18v and 24v positive and negative outputs.
The big question is .......
If I connect two transformer primaries in series then I should in theory get around 10v AC out of each transformer secondary. The problem would be that if a large load was applied to one set of secondaries then the other set of secondaries would then be out voltage wise (or would it ?).
Is it feasible to therefore connect the primaries in series and the secondaries in parallel to give me half the output voltage while maintaining a proper balance between the two transformers ? The transformers are identical.
The reason I'm asking is that I dont want to waste a lot of heat regulating the 30v rectified output from a single transformer down to around 2.5v at 6 amps (around a 165 watt dissipation) to drive some stepper motors. It would be easier to drop a 14v rectified output down and save around half the heat dissipation.
Two of the transformers are going to be connected straight to the mains and the secondaries straight to bridge rectifiers to give me approx 30-0-30v for a couple of variable supplies and to feed some opamp circuits. Another couple are going to feed a bunch of linear regulators to give me the usual 5v, 8v, 12v, 15v, 18v and 24v positive and negative outputs.
The big question is .......
If I connect two transformer primaries in series then I should in theory get around 10v AC out of each transformer secondary. The problem would be that if a large load was applied to one set of secondaries then the other set of secondaries would then be out voltage wise (or would it ?).
Is it feasible to therefore connect the primaries in series and the secondaries in parallel to give me half the output voltage while maintaining a proper balance between the two transformers ? The transformers are identical.
The reason I'm asking is that I dont want to waste a lot of heat regulating the 30v rectified output from a single transformer down to around 2.5v at 6 amps (around a 165 watt dissipation) to drive some stepper motors. It would be easier to drop a 14v rectified output down and save around half the heat dissipation.