Dual Power supply for my pre-amp - diyAudio
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Old 29th February 2012, 08:08 PM   #1
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Default Dual Power supply for my pre-amp

Greetings to all the members,

I need help to build a dual power supply for my pre-amplifier board which requires 22VDc (Max) for good operation.
The transformer which i have is a toroidal 50VA with Secondary output of 18v-0-18v.

PCB board that i have with me has been designed as per the schematic i have attached with this post.

I Request kind Members to Please recommend the components i hould use to receive the Maximum output of 22VDc & Best power filtering from this Circuit.
Any Kind advises will be deeply appreciated. Thank you.

Best Regards.....
Attached Images
File Type: png SP-5PCBSCH.png (6.1 KB, 139 views)

Last edited by SLAK; 29th February 2012 at 08:10 PM.
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Old 29th February 2012, 08:20 PM   #2
pdul is offline pdul  Denmark
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How much current do you need?
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Old 29th February 2012, 08:24 PM   #3
pdul is offline pdul  Denmark
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You can buy some cheap boards for something like this on Ebay
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File Type: png SP-2-PCB-SCH-LM317337.png (98.9 KB, 127 views)
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Old 29th February 2012, 08:27 PM   #4
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Quote:
Originally Posted by pdul View Post
How much current do you need?
About 1 amps is enough.
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Old 29th February 2012, 08:30 PM   #5
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Quote:
Originally Posted by pdul View Post
You can buy some cheap boards for something like this on Ebay
I bot the Power supply PCB from ebay, but for some reason the output from that board is 42VDc where as the input is 18-0-18AC, may be i need to change the components on the board.
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Old 29th February 2012, 08:30 PM   #6
pdul is offline pdul  Denmark
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You can obtain +-21v well regulated supply with up to 1,5 amps with this setup, with 18-0-18v ac with this setup
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Old 29th February 2012, 08:33 PM   #7
pdul is offline pdul  Denmark
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even at the best and without regulation you can only get around 24,2v +- out of the setup you have shown
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Old 29th February 2012, 08:37 PM   #8
pdul is offline pdul  Denmark
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18*squareroot of 2 - 1,2v drop in the rectifier
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Old 29th February 2012, 08:41 PM   #9
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Quote:
Originally Posted by pdul View Post
even at the best and without regulation you can only get around 24,2v +- out of the setup you have shown
Well that is what i Expected when i built the PS today, expected the supply to be max 24VDc, but i was shocked to see that the output is 42VDc where as the input to the board is 18-0-18ac, i have never come across this type of problem.
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Old 29th February 2012, 08:46 PM   #10
pdul is offline pdul  Denmark
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This is how it looks. I just build one for myself to use for experiments
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File Type: jpg SP-2-78795.jpg (186.0 KB, 107 views)
File Type: jpg SP-2-PCB-ONLY1.jpg (212.7 KB, 100 views)
File Type: jpg SP-2-LMSIZE.jpg (60.5 KB, 96 views)
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