Dual Power supply for my pre-amp

SLAK · 07:10 PM

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.....

pdul · 29th February 2012, 07:20 PM

How much current do you need?

pdul · 29th February 2012, 07:24 PM

You can buy some cheap boards for something like this on Ebay

SLAK · 29th February 2012, 07:27 PM

Quote:

Originally Posted by pdul

How much current do you need?

About 1 amps is enough.

SLAK · 29th February 2012, 07:30 PM

Quote:

Originally Posted by pdul

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.

pdul · 29th February 2012, 07:30 PM

You can obtain +-21v well regulated supply with up to 1,5 amps with this setup, with 18-0-18v ac with this setup

pdul · 29th February 2012, 07:33 PM

even at the best and without regulation you can only get around 24,2v +- out of the setup you have shown

pdul · 29th February 2012, 07:37 PM

18*squareroot of 2 - 1,2v drop in the rectifier

SLAK · 29th February 2012, 07:41 PM

Quote:

Originally Posted by pdul

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.

pdul · 29th February 2012, 07:46 PM

This is how it looks. I just build one for myself to use for experiments

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29th February 2012, 07:20 PM	#2
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	How much current do you need?

29th February 2012, 07:30 PM	#6
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	You can obtain +-21v well regulated supply with up to 1,5 amps with this setup, with 18-0-18v ac with this setup

29th February 2012, 07:33 PM	#7
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	even at the best and without regulation you can only get around 24,2v +- out of the setup you have shown

29th February 2012, 07:37 PM	#8
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	18*squareroot of 2 - 1,2v drop in the rectifier