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Gear / Technical Help => Remote Power => Topic started by: WiFiJeff on July 02, 2007, 09:26:34 PM

Title: "Dirty" DC power supplies?
Post by: WiFiJeff on July 02, 2007, 09:26:34 PM

I have been using a number of different external DC lithium-ion batteries, and have run into a problem.  I have two Power Stick lithium-ion supplies (small, variable 3.5 to 7V output); one of these causes a very low level noise on the meters of my MiniR82, the other is clean.  I have been running a Korg MR-1000 with the Battery Geek lithium-ion fixed output 11V cell, I am getting some low frequency junk in the signal, which may be DSD related or (I worry) maybe from the power supply.  What is the best way to test for this, and is there any easy fix to screen it out of the audio chain?

Jeff

Title: Re: "Dirty" DC power supplies?
Post by: it-goes-to-eleven on July 02, 2007, 09:51:14 PM

I've been wondering whether the power regulators in batteries can create problems. I'm sure some gear handles the noise better than others.. 

There is a great utility for linux called baudline.  It makes it easy to examine the spectrogram of the noise floor when running with different power sources, etc.  I did that when testing a cheap inverter:

http://taperssection.com/index.php/topic,71722.msg960770.html#msg960770

http://www.baudline.com