John is right, it will work with a 12 0 12 transformer .... depends somewhat on the VA rating ...
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so what is the rating on the one you have ??
Why ??
OK. So, lets imagine we have a tranny 12 0 12 out at 24VA [for no other reason that it's easy to work out]
![:thumbup:](https://madmodder.net/Smileys/default/happy0034.gif)
24vac out 24VA gives 1 amp load current.
BUT ... trannies here assume the EU nominal volts in to be 230vac ... we're often nearer 245vac.
The output voltage is at the full rated load ! ie. 1 amp.
Now we come to LOAD REGULATION
On a relatively small tranny it won't be very good, at 24 VA it's probably about 12%.
Which means at no load the output volts will be 12% higher than the full load 24 vac ie. some 26 vac.
To compound the felony we are shoving more volts into it than the 230vac nominal.
The upshot of this tripe means we will get considerably more DC volts, AT SMALL LOADS, than we think.
Hence a 12 0 12 12VA tranny will be quite OK in practice even if your wretched simulator doesn't think so.
If you get one of these really titchy 3VA trannies and measure the no-load volts out you will be surprised [ at first anyway] they are often way above the advertised value
![:zap:](https://madmodder.net/Smileys/default/electricf.gif)
but shove a 50mA load on them and they calm down.
Dave
Somewhere I have the schematic for one I built, see if I can find it ... might be on the laptop ...
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