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Old 17th May 2010, 11:55 AM   #1
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Default +/- 12v dc PSU Required

Gents

Anyone know where I can get a kit for a PSU that does:

Standard UK 230v AC to +12v DC AND -12v DC? Nothing too complicated. Or preferably something ready made.

This is for a wolfson DAC evaluation board.

Thanks

Chris
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Old 18th May 2010, 07:15 AM   #2
Mooly is online now Mooly  United Kingdom
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Well I thought that would be easy... and I haven't found one kit for what you want.

Why not make your own... dead easy, very low cost.
All you need is a suitable transformer, one bridge rectifier, two 78/79 series IC's and a handful of caps (four would do it, for the economy job )
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Old 18th May 2010, 07:37 AM   #3
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or if you want something with a PCB, could get this and a couple of 12v regs:

Universal +/-15V Power Supply - Jaycar Electronics

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Old 18th May 2010, 07:55 AM   #4
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The idea of making it doesn't frighten me away but I'm not great when it comes to understanding schematics. I'm a bit rubbish. Also, a PCB would help a lot.

Any clear instructions anywhere for a novice? (sorry - I'm a speaker builder - not great with electronics - eeek!)
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Old 18th May 2010, 08:06 AM   #5
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The Jaycar kit comes with PCB and assembly instructions, it has 15v regs 7915/7815. If you get a 7912/7812 pair you can just use them instead. Very easy.

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Old 18th May 2010, 08:17 AM   #6
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Yes - the jaycar one does look like it fits the bill actually. I need a 12v transformer for this - do I need centre tapped or dual secondaries? I have one of these: AC 230 V Toroidal Mains Transformers : Mains Transformers : Maplin - if I can't use that, what can I use?

Thanks all for your help so far

Cheers

Chris
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Old 18th May 2010, 09:39 AM   #7
col is offline col  Australia
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yeah the N91AZ will do the trick.

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Old 18th May 2010, 09:40 AM   #8
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Thanks for your help :-)
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Old 18th May 2010, 09:45 AM   #9
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when you order the 7912/7812 regulators make sure you get them in a TO-220 package.

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Old 18th May 2010, 10:41 AM   #10
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Chris... useful as Maplin are they are shall we say somewhat overpriced.

Have you any idea how much current the DAC needs... it will be well within the 78 regs capability but if it's much over a 100 ma or so you might need heatsinks on the regs.

A 12-0-12 tranny gives 17-0-17 volts DC after rectifying so that's 5 volts the reg has to drop. At 100ma thats 0.5 watts, anything higher than say 1 watt and a heatsink is needed.
Just something to watch... if you can hold a finger on the reg for 10 seconds and it doesn't burn then it's OK.

Have a look at,
Your Search Results | CPC

They do all the other components too.
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