#1

image.jpeg3024×4032 1.97 MB

does this mean the 5v pin is never used? i know the board generates 5v from its 12v rails.
i’m having noise issues with mannequins and monome modules with this board (i already got a replacement with the same issues) it seems to be related to the number of modules connected rather than which modules are attached to the board.

#2

have you narrowed the problem down to a specific module or two? are you using a switch of ext5v with your grid?

#3

It seems to be the mannequins modules because I’ve had the monome modules in another case with no problems (I’m using a switch). On the other hand I’ve had two of the Mannequins in another case and no problems. At first I thought it could be he three sisters (I have two) but as I kept adding Modules to the case the noise started again. It seems to be when it rises above a certain power threshold (below the one specified for the case). When I attach modules one at a time and then disconnect them again I don’t get the noise. The case is a move 208. I’m out of Ideas. Even changed the PSU.

#4

Ok I just disconnected all Mannequins modules and left the Monome modules in. Same issues…

#5

It would be very useful to provide a description of the noise as there are very many different sources of noise in electronic systems. Perhaps post a recording as well for extra thoroughness.

#6

here you go. I can even hear it faintly coming from the modules themselves. PE Noise.wav (1.5 MB)

#7

Do you mean you can hear it coming from the modules with no sound system attached? A mechanical noise rather than just noise in the audio output?

Which case & power supply is it? I don’t know too much about the Pittsburgh power supply options.

#8

yes, i can hear a very low volume version of this coming from modules.
it’s the move 208 by pittsburgh modular.

#9

with a Volgen 15V 4.34A

#10

Are you below 75-80% of the max of your case? There are a lot of warnings about such a trespass… I can go very near to the max without noise, but Doepfer cases are reportedly specially stable.

#11

should be around 50%

#12

I got exactly the same issue with my Move 208. Also having monome & Mannequins modules in my setup, after alot of testing with a friend, I came to the conclusion the -12V rail is really unstable. This is a example of the -12V output in red, audible noise yellow.

The LM22673 chip which ‘makes’ the -12V even makes sound itself when getting alot (within given specs, though) of mA thrown at it.
My PSU (or I should say both, because Michael from Pitts already send me a newer revision) is currently underway to Pittsburgh, and hopefully they can fix this…

1 Like
#13

Eek. I just bought this same case and haven’t even hooked anything up yet. Hope I get lucky and dodge this problem.

#14

interesting thanks for sharing. i just got rev5 of the board yesterday. which version do you have?

#15

@jasonw22 fingers crossed…
@kbk tried both Rev3 & Rev5, the noise thresh of the 5 seemed a bit better, but still there.

1 Like