cp-251: noise as audio output - hum

vier-personen · Post by **vier-personen** » Mon Jun 12, 2006 4:23 am

Hi,

I have cp-251 and when I plug the Noise-out into my volume pedal I get the noise but also a hum or buzz (I don´t know the appropriate term in english for german "brummen").

It sounds like it´s coming from the house electricity, but I only get it from the noise output on the cp-251, not from the LFO or other ouptuts on the cp-251, so it can´t be the wallwart, right?

Anyone knows a solution? Should I return it?

I´d appreciate any suggestions...

delay-newton · Post by **delay-newton** » Mon Jun 12, 2006 8:14 am

mine is quite as a sleeping baby!
check out your house electricity

cheers!!

GregAE · Post by **GregAE** » Mon Jun 12, 2006 9:04 am

What happens if you bypass the volume pedal and run the noise-out directly into your amp (set at low volume)? Have you tried different cables?

It's possible that the buzz is coming from the wall-wart (the Noise is the only audio output, so a buzz will probably only be apparent there), but more likely the buzz is caused by a ground loop. Try different cables, different power (another outlet), etc. The idea here is to systematically eliminate each element to get to the source of the problem.

Greg

vier-personen · Post by **vier-personen** » Mon Jun 12, 2006 4:06 pm

thanks for the replies.

I tried the thing into my bass amp and into a mixing console both with Mono (TS?) & Stereo (RTS?) cables, testing two moog wallwarts in 2 houses.
I always get the hum which is as loud as the noise itself.
Just to be sure, the noise should be white noise?

Again, there´s no hum when I connect the LFO to the audio inputs.