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Old 14th December 2009, 05:01 PM   #1
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Default Power supply output connections?

I have a couple of basic questions regarding power supply output connections.

I want to connect a supply to a DAC that requires 24 volts and has only two power input wires Red/Black (+/-) and I have a power supply that has three output wires: 24volt+-0-24volt- ...do I connect the +/- to the red and black wires and connect the 0 to chassis ground? Or the 0 to circuit ground?

Or do I need a power supply with only two wires (Red/Black +/-) ?

Second question is, I want to power the TDA1545A seperately and I have a 12volt 5amp supply that I want to use...am I correct that I can use this supply and the TDA1545A will only draw the current it requires without frying it or am I going to have a melt down?

Thanks for any information.


T.D.
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Old 14th December 2009, 05:11 PM   #2
Mooly is offline Mooly  United Kingdom
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You need to know,
1. Is the DAC requiring 24volts AC or DC. Don't assume just because of wire colours

2. Your PSU... to get 24 volts DC you take the 24+ and the zero (0).
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Old 14th December 2009, 05:12 PM   #3
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Just use half of the 24V supply:- put the red wire to +24 and the black wire to 0V, leave the -24V terminal unconnected.

Your 12VTDA1545 will pull whatever current it needs from the 12V supply. No meltdown (well maybe if you crank Led Zeppelin to 11 on 2ohm speakers
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Old 14th December 2009, 05:13 PM   #4
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Mooly- you're fast on the trigger
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Old 14th December 2009, 05:14 PM   #5
Mooly is offline Mooly  United Kingdom
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Sorry, second question, yes the TDA will draw what is required.
TBH a 5 amp PSU sounds as though (and I may be wrong.. haven't seen it) that it isn't designed for high regulation and low noise... which is what you want for a DAC. It won't do any harm as long as the 12 volts is stable (if that IS the voltage you need... would have to look the TDA data sheet up).
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Old 14th December 2009, 05:16 PM   #6
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Iain McNeill View Post
Mooly- you're fast on the trigger
lol
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Old 14th December 2009, 07:09 PM   #7
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Thanks for all the replies.

I double checked, the DAC itself can use anything from 12 to 24voltsDC and the TDA1545A requires 12volts.

The 5amp figure in my oirginal post is a typo...it is actually a 12 voltDC 1.5 amp regulated linear supply that I bought at a military surplus store, but with tight regulation and low noise now in mind I have decided to build one of these supplies for my project to power the TDA1545A:

The σ11 Regulated Power Supply



T.D.
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Last edited by Tony D.; 14th December 2009 at 07:37 PM.
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Old 14th December 2009, 09:19 PM   #8
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I've decided to build two of the sigma11 supplies for my DAC, one at 12volts for the chip and one at 17volts for the DAC itself...no sense in doing half measures IMO.

Just ordered the boards, mosfets etc.


T.D.
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Old 15th December 2009, 06:05 AM   #9
Mooly is offline Mooly  United Kingdom
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That's good... just take it slowly
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