Newbie question - can I use my pc 24V 10A power supply for TDA2050 or LM3886 amp - diyAudio
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Old 29th December 2012, 04:17 PM   #1
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Default Newbie question - can I use my pc 24V 10A power supply for TDA2050 or LM3886 amp

Hi,
I am just starting to play with electronics and decided to build a very simple amp. I am looking for something around 20W of power but am interested in a nice clean sound. Could I use an old pc PSU with 24V/10A/150W max rating for either a TDA2050 or LM3886 amp.

Any suggestions greatly appreciated.

Thanks
Arvind
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Old 29th December 2012, 04:25 PM   #2
Mooly is offline Mooly  United Kingdom
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For several reasons its not ideal.

What you really need is a dual or split supply that gives equal positive and negative rails. Your computer supply is a single rail and this means you must use a circuit configuration for the chip amp that is specifically designed for this type of single rail.
Also switching supplies bring there own issues such as being electrically "noisy" generating high frequency hash.

A small 100 to 150va toroid and two moderate sized reservoir caps of say 3300uf to 6800uf would be ideal. Voltage rating to suit the chip you decide on.
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Old 29th December 2012, 07:55 PM   #3
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Thanks.. I was hoping to not mess with PSU part of the project..
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Old 29th December 2012, 08:14 PM   #4
DUG is offline DUG  Canada
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OR

Use two as split supplies with a very good dual C-L-C-L-C filter to take out the junk that Mooly noted.

A little close to the +/- 25V max for TDA2050 but you could add a few diodes for drop or add a linear (high current) regulator.

Or it might be easier to:

"A small 100 to 150va toroid and two moderate sized reservoir caps of say 3300uf to 6800uf would be ideal. Voltage rating to suit the chip you decide on. "

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Old 29th December 2012, 09:06 PM   #5
wahab is offline wahab  Algeria
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Quote:
Originally Posted by DUG View Post
OR

Use two as split supplies with a very good dual C-L-C-L-C filter to take out the junk that Mooly noted.
SMPS bricks have the negative pole connected to the earth
so putting two in series would yield a short circuit for the one
connected as negative PSU.

A solution is to remove the earth connection of the negative side
PSU since it will be forcibly connected to earth via its common
connexion with the other PSU.

That said , a genuine dual supply , SMPS or not, is a better option.
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Old 30th December 2012, 02:57 AM   #6
DUG is offline DUG  Canada
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Well, shiver me timbers, I did not know that.

So I checked out the six that I had in a box right beside me.

Four are as you say and have connections to the AC ground.

Two did not (only one is a two wire)

Learn something every day... thank you.

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Old 30th December 2012, 03:30 AM   #7
DUG is offline DUG  Canada
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Quote:
Originally Posted by wahab View Post
SMPS bricks have the negative pole connected to the earth
so putting two in series would yield a short circuit for the one
connected as negative PSU.
Yes it would.
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