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In Reply to: RE: Ugly, it's a good thing you asked ahead of time posted by Ugly on October 10, 2014 at 21:39:23:
That's NOT a doubly or a doubler! 18 VAC RMS, actually gives you sq. root 2 * RMS VAC = 26 P-P voltage, which is fine. An actual doubler would give you 2 * P-P or 52 volts! That is great if you need plus and minus rails, +18-0--18, which is a 36 volt difference.
You should measure and report on the scope trace at the output rails AFTER the regulators, because it is unclear whether the preamp runs on balanced rails OR a single rail. You have two regulators in the picture, so I suspect balanced rails, i.e., +9-0--9 and not +18-0. You should trace the diagrams out by careful examination. Here are ways voltage doublers actually work, but I don't think that is what you have:
Yes, in general, they are NOT a good idea. However, I had a tube preamp run off a voltage doubler. With suitable capacitors, it sounded OK. It's usually an issue of which transformer is readily available.
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Follow Ups
- RE: Ugly, it's a good thing you asked ahead of time - jedrider 07:49:06 10/11/14 (1)
- RE: Ugly, it's a good thing you asked ahead of time - Ugly 08:58:54 10/11/14 (0)
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