Tweakers' Asylum

To get to 12 volts

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jedrider

A

In Reply to: RE: That's a tough one posted by 1973shovel on March 15, 2024 at 06:44:36

what do you think the best transformer output is?

I have a center-tapped 20 volt transformer, which I think is equivalent to a 10 volt full-wave rectified power supply. Is that cutting it too close, do you think? So, that's like only 14 volts DC, yeah, pretty close, but maybe doable, no?

I like the sealed power tranformers with a pig tail so I don't have to worry about electrocution issues, but this is a bare transformer, unforturnately.

Follow Ups:

12 volts at what current draw? - 1973shovel 07:46:00 03/16/24 (2)
There's no way to speculate on whether your transformer would suffice without knowing the application it would be used for, including the specifications of the transformer to be sure it will supply adequate current. And, as I replied to one of your similar posts from twelve years ago, Paul McGowan of PS Audio believes that bigger is better, with regard to current (link below)

I'd suggest that you find a schematic or two, then start researching low voltage drop regulators if you feel your transformer voltage is going to be close for your application.

Good luck.
- 10A transformer (Open in New Window)
- RE: 12 volts at what current draw? - jedrider 14:36:36 03/16/24 (1)
  I had an industrial power supply that I recently sold which was rated at five amps. It didn't do anything special for me. Just, maybe, amps is not everything and big electrolytics are more important. I don't know, but it's easy enough to put stuff together, though doing the case work has always been challenging as well. Thanks for your input.
  - RE: "maybe, amps is not everything" - 1973shovel 18:27:53 03/16/24 (0)
    No, I would agree that an oversized transformer isn't 'the answer', but if "big electroylytics" are, then it would be simple enough. Buy one of the many linear supplies offered on ebay, and just add a large amount of capacitance to it.
    Below is a link to my take on the Belleson voltage regulator. As noted, I was running the Slee phono stage with two large motorcycle batteries in series, as a 24 VDC supply. Many think of batteries as the holy grail of DC, but when I replaced the Slee's internal 7818 (+18v) regulator with the Belleson regulator being fed by the battereies I got blacker backgrounds, more detail, and more musical involvement.
    Edit: I'm not suggesting that a quiet regulator is the sole answer either. As noted, I'd locate a known good schematic, then build the power supply with quality parts.
    Good luck with whatever you decide to do.
    - Belleson/Slee (Open in New Window)
    Edits: 03/17/24

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