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Old 14th May 2005, 05:13 PM   #1
Tyimo is offline Tyimo  Hungary
diyAudio Member
Join Date: Nov 2002
Location: Hungary
Default External PSU for preamp


Could somebody help me how to make a symmetrical +/-24VDC PSU from a simple 24V AC?
I would like to use an external transformer and the bridge rectifier and caps etc. inside the case of the preamp.
I find something like what I need, but I don't need regulated, only passive PSU.


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Old 15th May 2005, 06:54 PM   #2
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
get your reference books out and find a voltage doubler.
Compare to your schematic top half & then bottom half.
I have not seen the idea of using reverse polarity to generate dual voltage and central ground before. Nice one if it works.
Build up a quick test circuit without any regulators and test the output voltages without a load. Should be about 2* sqrt2 * V or about +-30Vdc. All this from a single 12Vac secondary!!!
If it comes out this big then I will be very surprised.
Give us some feedback after you try it.
regards Andrew T.
Sent from my desktop computer using a keyboard
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