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Re: Problem noise from EDP

At 02:45 AM 8/27/98 -0700, Kim wrote:

>At 7:01 PM -0700 8/26/98, Floyd wrote:
>>
>>When I hold the record button long enough to clear the
>>current loop it puts out a noticeable pop, or thump.
>>Is there some way to fix this ?
>
>actually, yes, you should be able to fix that. Requires that you actually
>get into the box, though. There's a trimpot on the PCB, near the left
>side, by the volume knobs. It's job is to trim a dc offset from a VCA.
>Sounds like your's is not set right for some reason, which would cause
>the thump you hear.

Kim,

  I found the trimpot and followed the procedure your prescribed.
  First of all, along with the 60Hz sound from turning the VCA
  on and off, there was also a warbling kind of a sound that was
  not affected by the trimpot.  However, I was able to pick out the
  60Hz tone and get it to a minimum.  Actually I think it was alread
  trimmed to this point when I started.

  After putting the unti back together I played around a bit to see
  if the problem was gone.  In doing so I realized that the thump
  noise occurs not when I clear a loop that is playing.  Rather,
  it happens when I press and hold the record button while the EDP
  is recording.  Of course I do this when I flub a loop recording
  and want to erase it before it has a chance to play at all.

  So, to summarize:  the VCA's DC offset seems to be trimmed to nil,
  there is no thump when I clear a loop that is playing.  There is
  a thump when I clear a loop in the midst of recording.

  Is that a known problem with, hopefully, a known solution?



**************** 
  ********** Floyd Miller
    ****** floyd@voicenet.com
      ** http://www.voicenet.com/~floyd