Phrazemaster
Well-known member
Hi all,
I've got a PSU I'm building that has 2 transformers, a toroid and a conventional type. They are both rated for 120/240 use on the primary, depending on how they are wired.
I have a voltage selector switch, 120/240, that I want to use to switch both with. I actually did this before, and it seemed to work fine, but then I thought since I'm redoing it I better ask. I can't seem to find anything on google about it.
My concern is, is this safe? The same switch wiring both transformers? Or would secondary currents flow between them due to different windings presenting different impedance? Obviously they are both at the same potential, so I *think* it's ok.
The PSU I did this with before worked, no smoke, and was stable, but it did hum.
Any thoughts? Attached pic of wiring.
Thanks,
Mike
I've got a PSU I'm building that has 2 transformers, a toroid and a conventional type. They are both rated for 120/240 use on the primary, depending on how they are wired.
I have a voltage selector switch, 120/240, that I want to use to switch both with. I actually did this before, and it seemed to work fine, but then I thought since I'm redoing it I better ask. I can't seem to find anything on google about it.
My concern is, is this safe? The same switch wiring both transformers? Or would secondary currents flow between them due to different windings presenting different impedance? Obviously they are both at the same potential, so I *think* it's ok.
The PSU I did this with before worked, no smoke, and was stable, but it did hum.
Any thoughts? Attached pic of wiring.
Thanks,
Mike