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Old 2nd February 2013, 09:16 AM   #1
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Default +/- dc power supply

Hi there

I am wanting to build a new psu for 2 class d amps that I have to get rid of the bricks that I am currently using.

I have seen on eBay and other sites a number of circuits for this purpose that would allow me to mask use of some toroidal transformers I have from older projects.

My questions are as follows...

Can I plug one amp into the +dc and the other into the - dc?

How can I get only + dc out of one of these boards?

Is there a better option?

Look forward to hearing from you.

Neil
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Old 2nd February 2013, 11:12 AM   #2
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You'll need to provide more information to get the help you seek. What are the outputs of the bricks you're using, and what are the transformers you have?
Quote:
Can I plug one amp into the +dc and the other into the - dc?
Probably not a good idea.
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Old 2nd February 2013, 01:58 PM   #3
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The amps are able to take between 10 and 30 volts dc.
The bricks are 12v 5amp Dc.

I have two toroidal transformers available one at 18volts and one at 24volts off the secondaries.
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Old 2nd February 2013, 03:24 PM   #4
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So, please correct me if I am wrong...

I parallel up the secondary's to give me a higher current output

Run it through a rectifier to give me dc voltage.

Stick a nice fat smoothing cap across the dc and that's about it.

Is that right?
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Old 2nd February 2013, 05:50 PM   #5
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That's basically it.
You need to keep in mind things like phase when paralleling secondaries, and peak voltage and ripple voltage when smoothing the dc.
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Old 2nd February 2013, 06:09 PM   #6
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Great thanks sofaspud.

Ill keep an eye on the phases but the data sheet has that in.

I have 4 rubicon 10000uF 50v caps kicking around. Do you think they'll do for smoothing?
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Old 2nd February 2013, 06:21 PM   #7
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Yes. But be aware that the 24V transformer will likely be over 30V after rectification and smoothing.
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Old 2nd February 2013, 06:23 PM   #8
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That's great, I'll run with the 18volt transformer to be on the safe side.

Thanks for you help.
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Old 2nd February 2013, 07:00 PM   #9
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Old 2nd February 2013, 07:19 PM   #10
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Yes. Not sure you need 0.04F for your supply. Am sure you need a fuse on the unshown primary.
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