I have 2 identical transformers...240v ac input and 20v ac output.
I plan to wire the primaries in series so each transformer's output would drop to 10v ac.
Then wire the outputs in series to give a 10v-0v-10v ac dual rail output.
With the working voltage de-rated to half for each transformer I don't anticipate any load problems..
Use case is as dual rails for a DAC output stage that requires 12+ve-0-12-ve dc.
Would this work ? anything I need to consider ? do I need LDO regs or would a LM317/337 be ok dropping only 2 volts.
Thanks,
Bob.
I plan to wire the primaries in series so each transformer's output would drop to 10v ac.
Then wire the outputs in series to give a 10v-0v-10v ac dual rail output.
With the working voltage de-rated to half for each transformer I don't anticipate any load problems..
Use case is as dual rails for a DAC output stage that requires 12+ve-0-12-ve dc.
Would this work ? anything I need to consider ? do I need LDO regs or would a LM317/337 be ok dropping only 2 volts.
Thanks,
Bob.
That will be unstable and if, say, one rails draw is a higher current that the other, the voltage on the lower draw rail will rise.
Primaries in parallel with 2 x 20v AC out, will give 20 x 1.414v RMS DC x 2, that through a regulator on each side, will be fine as the regulators are OK with an input voltage of 35v.
Primaries in parallel with 2 x 20v AC out, will give 20 x 1.414v RMS DC x 2, that through a regulator on each side, will be fine as the regulators are OK with an input voltage of 35v.
You could start with 20+20 and bring them down as DC.
Separate primaries each 240v but connect the secondaries in series for 20-0-20 then rectify and regulate... ?
or series after rectification for +28-0-28- and regulate ?
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