This is the first project I've attacked where this situation has arisen, so I need to ask a question here.
My current project requires two, maybe three, DC voltages for different portions. So far I know I'll need +12 vDC and +6 vDC, both well under 1 A current draw. I have some PS kits which use an LM317T voltage regulator to provide an adjustable DC output from 3 volts up to 37. Each board has its own FW bridge rectifier diodes and filter cap on the input side of the voltage regulator. Output is the +V and Common pair. Okay, simple enough.
Here's the burning question. Can two such supplies share their Common connections IF (big IF) they're also sharing the same transformer secondary winding on the input? Or should each be given its own secondary, which would most likely imply two transformers. Using two transformers is not a problem, I'd just rather use only one for simplicity sake if it'll work. I doubt I can easily find a transformer with dual secondaries at the local shop, so I'm not considering that option.
I'm sure this has come up before for others, so an answer would be much appreciated.
TWR
My current project requires two, maybe three, DC voltages for different portions. So far I know I'll need +12 vDC and +6 vDC, both well under 1 A current draw. I have some PS kits which use an LM317T voltage regulator to provide an adjustable DC output from 3 volts up to 37. Each board has its own FW bridge rectifier diodes and filter cap on the input side of the voltage regulator. Output is the +V and Common pair. Okay, simple enough.
Here's the burning question. Can two such supplies share their Common connections IF (big IF) they're also sharing the same transformer secondary winding on the input? Or should each be given its own secondary, which would most likely imply two transformers. Using two transformers is not a problem, I'd just rather use only one for simplicity sake if it'll work. I doubt I can easily find a transformer with dual secondaries at the local shop, so I'm not considering that option.
I'm sure this has come up before for others, so an answer would be much appreciated.
TWR