MXR phaser

[Brian.Dekok at ca.jdsunph.com]

Speaking of the MXR phaser, I have one at home that's not working. The sound
changes slightly when the button is switched, but I think the LFO isn't sweeping
it. Can someone tell me of a similar transistor to the C1849?  Also, does this
pedal use BBD's? The chips in it are TI 72L044's. Any help would be appreciated.




Don Tillman <don at till.com> on 01/28/2000 04:24:07 AM

To:   WeAreAs1 at aol.com
cc:   farky at ix.netcom.com, synth-diy at mailhost.bpa.nl (bcc: Brian Dekok/HQ/JDS
      FITEL Inc)
Subject:  Re: vibrato




   From: WeAreAs1 at aol.com
   Date: Thu, 27 Jan 2000 23:55:41 EST

   farky at ix.netcom.com wrote:
   << Does anybody know of a simple circuit to produce vibrato on an input
   audio signal?  The vibrato I'm speaking of is the pitch-shift kind, not
   to be confused with tremolo. >>

   You can use an analog delay chip (BBD) and modulate its clock with an LFO.

Another approach is to use a phase shifter circuit without the
original signal mixed into the phase shift output.  That means you can
take a standard phase shifter stomp box, like the ol' MXR Phase 90,
and clip one connection, and it's a vibrato.  Note that the effect can
be pretty subtle at low sweep speeds.

 -- Don