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Old 2nd May 2005, 05:38 PM   #1
PH is offline PH  Slovenia
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Default Battery Power Supply

Hi to all!

I am thinking to try out batteries in my audio projects. I wonder if enyone has some experiences with batteries...

Best regards,
Primoz
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Old 2nd May 2005, 05:42 PM   #2
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batteries have no ripple, they do have noise -- not a lot -- however.
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Old 2nd May 2005, 06:37 PM   #3
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just to show you what I mean -- here's the DC to 100kHz noise of a 9V battery -- the scale is 50 uV (uses a Tek ADA400 amplifier)

Click the image to open in full size.

and here's the noise of a 50 ohm BNC terminator, same bandwidth:

Click the image to open in full size.
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Old 2nd May 2005, 07:24 PM   #4
PH is offline PH  Slovenia
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Dear jackinnj,

so you suggest that a good classic power supply tend to sound better then battery p.s.?

Primoz
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Old 3rd May 2005, 12:03 PM   #5
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a battery will have lower noise than most standard, off the shelf regulators, you just have to replace batteries every once in a while. even though the noise can be "out of band" -- meaning that it is inaudible -- it can still screw with the preamplifier circuitry.

If you don't want to build discrete regulatory circuitry, Texas Instruments and Linear Technologies make some very good low noise off-the-shelf regulators. If you want to build very high performance regulators search the forum for "super regulators".

there are some who like the sound of a regulated power amplifier -- and there are some high end companies who build expensive regulated power amplifiers. I will let the jury decide whether it's a good idea.
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