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Re: problem with the DIY kit #2

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  • david rothbaum
    yes i tried this -- grounding it to something else and that did not solve the problem. my feeling is that there is an issue with the power supplies.
    Message 1 of 8 , Jan 1, 2008
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      yes i tried this -- grounding it to something else and that did not solve the problem. my
      feeling is that there is an issue with the power supplies.

      --- In Doepfer_a100@yahoogroups.com, "Tim Stinchcombe" <timothy@...> wrote:
      >
      > hi David,
      >
      > > I does seem like a ground issue though since the noise module hums
      > as do the non
      > > working cwejman modules. Funny thing is that the spring reverb does
      > not hum...
      >
      > I think it may be the ground too. From the photo of the kit at
      > Doepfer's site, to produce -12V - 0 - +12V from two identical
      > wallwarts, the '0V' from neither of them can actually be ground
      > (hence why it is OK to run them in series, with the '+12V' of one
      > connected to the '0V' of the other, essentially giving the required
      > 24V), and I'm assuming that you have been given something very
      > similar by Analog Haven. Thus when you have modules hooked up and
      > connected to other equipment, there may not be a decent ground
      > reference for the modules connected to the kit, which might then act
      > weirdly (though I'm a little surprised that any patch leads are not
      > supplying this). I'd suggest connecting the ground on the kit bus
      > board to a suitable ground somewhere on the external equipment, and
      > see what that does.
      >
      > Tim
      >
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