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Power Supply for Amp.
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Old 6th February 2007, 02:42 AM   #1
hernanstafe is offline hernanstafe  Argentina
diyAudio Member
Join Date: Feb 2007
Location: Argentina
Default Power Supply for Amp.

Ok i've just built an amp using TDA2030 IC, i used the single power supply version of the circuit tanken off the component Datasheet. Now, i've tested it with a computer power supply and it works ok, but i'd like to build a power supply for it but if i use a common one, i get a horrible sound, so i take it it has to be very very filtered if not regulated (if i'm not wrong, it has to have very small ripple...)any schematics for such thing? cause i thought using LM7812 to regulate and capacitors to filter but i'm not sure if it'll be enough.
Thanks again everyone!
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Old 7th February 2007, 07:27 PM   #2
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
most decent chipamps have adequate Power Supply Rejection Ratio (PSRR) to hide the small ripple at quiescent conditions and to hide the big ripple when delivering significant output current.

A conventional unregulated PSU consisting of just a transformer + rectifier + smoothing cap is usually enough for a single supply ?Vdc to 0Vdc.

Be careful to ensure the maximum voltage from your PSU is less than the absolute maximum Chipamp voltage requirement.
regards Andrew T.
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Old 7th February 2007, 09:17 PM   #3
ouxly40 is offline ouxly40  United States
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Location: sitting on CPU fan
Default Regulation

The 78xx series regulators are easy, stable and reliable. They however, are not so good at rapidly changing current draw. You want to use a series pass regulator. You may also try a much larger filter cap on the one you have.
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