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Old 2nd August 2010, 08:47 PM   #1
onis_uk is offline onis_uk  United Kingdom
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Question How do i build a 12v power supply ?

i need a 12v toroidal power supply no more than about 5 amps max, to power my valve preamp. how do i build one or is there somewhere i can buy one ??
cheers Dom
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Old 2nd August 2010, 08:52 PM   #2
onis_uk is offline onis_uk  United Kingdom
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could i use this ???

Last edited by onis_uk; 2nd August 2010 at 08:54 PM.
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Old 2nd August 2010, 08:52 PM   #3
Atilla is offline Atilla  Norway
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Buying a 12V PSU should be both cheaper and easier than making your own. Get a standard double-insulated unit and enjoy. 12V is a standard value, they should be available pretty much everywhere.
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Old 2nd August 2010, 08:54 PM   #4
onis_uk is offline onis_uk  United Kingdom
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i know but i have read that those kind of power supply's will introduce noise into my valve preamp, i want the best possible sound quality
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Old 2nd August 2010, 08:59 PM   #5
Atilla is offline Atilla  Norway
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Just to be sure - you need AC or DC? What kind of preamp are we talking about here?
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Old 2nd August 2010, 09:00 PM   #6
onis_uk is offline onis_uk  United Kingdom
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240v ac in and 12v dc out i have a valve preamp made by arjen helder
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Old 2nd August 2010, 09:17 PM   #7
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is this for the heaters only and you have the high voltage taken care of ?
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Old 2nd August 2010, 11:47 PM   #8
Atilla is offline Atilla  Norway
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There are good 12V supplies for charging batteries, laptops and driving some larger devices, that should be perfect for what you need. There are quite good ones and if it's heaters only, you shouldn't really worry at all.
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Old 3rd August 2010, 04:58 PM   #9
onis_uk is offline onis_uk  United Kingdom
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no this is to power the whole amp the amp provides its own hi voltages on board, you just need to feed it 12v dc !
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Old 3rd August 2010, 05:02 PM   #10
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You could always use a computer power supply, that'll give you 12volts and more amps than you'd want
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