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Old 23rd December 2007, 05:28 PM   #11
gootee is offline gootee  United States
diyAudio Member
Join Date: Nov 2006
Location: Indiana
Originally posted by Mark Kelly

I don't know what drugs whoever ran that trace was on but I hope they were good.

I've tried to replicate these results on ordinary SLAs and can't come close.

Feeding the SLA's output to an HP3580A spectrum analyser and dialling it to 100uV full scale I get a trace at the -60dB mark with a couple of small bumps at 100, 200 and 400 Hz which I put down to mains harmonics. That's -60 dB with reference to the 100uV full scale so we're talking 100nV, or -150dB referred to the battery's DC voltage.

Same result with the battery sending 200 mA through a wirewound resistor.
Interesting. The plot he gave does seem to be suspect. For example, why does it have a large 50 Hz peak?

I've just read part of the thread in which the plot was originally posted (in post #202). I recommend it for further reading about battery-based power supplies:

The electrolytic capacitors ARE the signal path: http://www.fullnet.com/~tomg/zoom3a_33kuF.jpg
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