12V DC to +/- 32V? Do I need to use 220 inverter? - diyAudio
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Old 11th November 2006, 03:40 PM   #1
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Default 12V DC to +/- 32V? Do I need to use 220 inverter?

If I want to supply a DIY preamp, for example +/- 32V, I could use a 12V DC to 220AC inverter, and a current PSU from 220 to +/- 32, but..
could be done a good power supply without having to go to 220AC? And would be clean as well as a current PSU?
I know some comercial devices have something like this inside, and can be powered at 12V or less.
Are avaible comercial devices from 12V DC to +/- superior voltages or must be DIY?
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Old 11th November 2006, 04:08 PM   #2
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No, that would be a waste, first to pump it up and break it down again....

Look at this:Make a car amplifier

Look at the link in post#3......

These devices called SMPS (switching mode power supply) are for sale in ready made packages too.....
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Old 11th November 2006, 04:37 PM   #3
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Perfect! , but what about noise? Are those SMPS perfect clean for a high-end preamp or AD converter?
Can you give me a link where to can buy those made packages?
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Old 11th November 2006, 05:12 PM   #4
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I don't know if they're clean enough, but I think they can be made just as clean as any psu. If they aren't allready....

Here's a link...
http://www.powerstream.com/dc2.htm
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Old 11th November 2006, 05:14 PM   #5
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Click dc/dc converters in the menu on the left and you'll have a lot of choice (even custom...).
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Old 11th November 2006, 05:20 PM   #6
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Quote:
I don't know if they're clean enough, but I think they can be made just as clean as any psu. If they aren't allready....
Do you mean that comercial ones? Do you mean, that if those are not clean enough could be modified to can get it?
If can be made as clean as a psu, would be the perfect option, at least for consumption, weight and space.
Iīm looking on the link...
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Old 11th November 2006, 05:33 PM   #7
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I know dacs can pe very picky to clean power, a preamp can probably work fine on a standard smps.

Standard smps can be made pretty "clean" with for instance a regulator and filters/filter caps... Don't know everything about this though....Most smps circuits have these devices allready on board..
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Old 11th November 2006, 08:17 PM   #8
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The web devices seem not very subtle to use as preamp supply I think.
The 12-48V tells, "topology, booster non-isolated".
I have gone to http://webench.national.com/appinfo/...d=1&flow=power
I can get shematics, but think I will need a little help there.
Hope N-Channel pass through this post and swtich some lights.
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Old 12th November 2006, 03:50 AM   #9
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What 32V preamp did you have in mind? There should be preamps (and dacs) that work directly from the 12V...

Is it a car project?

Above this I don't really understand some details from your last post.
I've seen stabilisation circuits that can practically iron down mount everest size impurities.
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Old 12th November 2006, 11:38 AM   #10
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I've seen stabilisation circuits that can practically iron down mount everest size impurities.
Perfect!!.

This is one candidate as peamp:http://www.jlmaudio.com/Baby_Animal_Mic_Pre.htm

Itīs a kit I must mount. Itīs afordable price and there are people using them on studio recording with very good results.
It can run at 12V also, but this would mean internal +-6V. Till I know, and as tell in the web, better results are if higher +- voltage, so if can get them from SMPS, and stabilized ok, so thatīs a perfect solution.

The other device I woul like to mount, is a AD (analog to digital converter). I want to take a Cirrus Logica Evaluation board . CBD5381. I have been suggested to change the op-amps and would get a high quality AD converter.
I would like to do the same, with SMPS, but here IĻm afraid if there would be beating frequencies with the preamp one, and more important, if would be any beaten frequencies with the internal clock of the AD that runs at 13MHZ. That must can be solved anyway.
This comercial unit has 12V input, as well as the AC one. I think it must have inside a SMPS, something like this, is what I would like to build.
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