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| Source a transformer with multiple secondaries |
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| MarkF:
I would like to build a simple linear power supply with three outputs (i.e. 5VDC, +12VDC and -12VDC). I want to keep the 5V GND independent of the +/-12V GND. Only looking for a 1A capability max on each output. Does anyone know where I can find a single transformer with three secondaries instead of two transformers? |
| schmitt trigger:
Perhaps the easiest would be to purchase a toroid transformer which can provide the +/- 12v supplies, and then hand wind your own winding for the 5v supply. Window area allowing it, of course. |
| station240:
You can get multitap transformers, been out for decades. I have no idea where you get them in the US, all the electronics stores in Australia sell them. Try searching ebay for "transformer 9V+9V 15V+15V", seems to be some usable results there. |
| Benta:
Or just get it made to order. No big deal nowadays. There are transformer companies that'll make one-offs. Search the interwebs. |
| Zero999:
Digikey sell them but the power rating for the 12V secondary is a bit less than your requirements, at only 250mA. https://www.digikey.co.uk/product-detail/en/signal-transformer/14A-30-512/595-1705-ND/1117954 How about using two transformers or a switched mode power supply for the 5V part, which presumably isn't so sensitive to noise and ripple? Another option is to use a transformer with two secondary windings with one connected to a voltage doubler to get the +/-12V, although it would need to be considerably over-rated. |
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