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Re: My super cheap semi-diy PC desktop system:)

Posted by Ugly (A) on February 8, 2007 at 14:56:55

In Reply to: Re: My super cheap semi-diy PC desktop system:) posted by Frank25 on February 8, 2007 at 10:27:17:

Your amp will still work fine with slightly less than 12V. You could easily design an LDO to drop less than 100mV or so depending on the FET you bought. You probably would not be able to identify the amount of difference in the sound without special equipment assuming the drop was small enough.

Another approach would be some type of PI filter, ie CLC. This requires really big capacitors on the secondary side of the filter in order to keep ripple low enough. However this approach could be even quieter than the LDO appraoch since the braodband silicon noises would get filtered. The main drawback with this type of filter will be the output impedance and the resulting ripple.

I think an LDO would give the most bang for the buck for what is important to me: Low noise, low ripple, and low output impedance.

Either way you decide to go, throwing more money at the problem gets you closer to the same ideal goal in the end but with different tradeoffs. You gaotta decide what is most important to you.

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