Any suggestions to quiet down a Voodoo lab anolog chorus?

Started by BDC, June 10, 2010, 08:16:14 PM

Previous topic - Next topic

BDC

I just bought a Voodoo Lab Anolog chorus which was discontinued from production a little while back.
I purchased it "new" from a store for full price since they are getting harder to come by. When you crank up the intensity it gets a little noisy, meanwhile my old CE-2 doesn't! Any simple remedy to quite these things down a little? Cap change? Pot cleaning? Or is the noise cause by the chips in these things....Are some chips noisey and some not? Thanks in advance for any helpful advice.

petemoore

  Part of the circuit that matters, the power supply, isn't referred to.
  Refer to PS as a source/input for noise.
Convention creates following, following creates convention.

Mark Hammer

What sort of noise are we talking about?  Purely hiss, or something else?

Most BBD-based devices walk a tightrope between maximum bandwidth and minmum hiss.  The more you ask of the one, the less you get of the other.  In the case of chorus pedals, when people opt for a "tick" sound, they generally want juuuuuuusssstt a little more delay time out of it, which can sometimes result in the accompanying clock noise (which is shifted downwards in the spectrum exceeding what the onboard filtering is capable of removing.  Shortening the delay range by opting for a smaller clock cap (i.e., the one snuggled up against the MN3102, MN3101, CD4047, or whatever the circuit uses to generate complementary clock pulses) will raise the clock frequency to one hopefully above where the onboard filtering rolls things off.  So, if there is a 220pf cap in there, scoring a 200pf cap as a substitute might alleviate some of the noise, without affecting effect intensity too much.

BDC

Quote from: Mark Hammer on June 11, 2010, 09:24:15 AM
What sort of noise are we talking about?  Purely hiss, or something else?

Most BBD-based devices walk a tightrope between maximum bandwidth and minmum hiss.  The more you ask of the one, the less you get of the other.  In the case of chorus pedals, when people opt for a "tick" sound, they generally want juuuuuuusssstt a little more delay time out of it, which can sometimes result in the accompanying clock noise (which is shifted downwards in the spectrum exceeding what the onboard filtering is capable of removing.  Shortening the delay range by opting for a smaller clock cap (i.e., the one snuggled up against the MN3102, MN3101, CD4047, or whatever the circuit uses to generate complementary clock pulses) will raise the clock frequency to one hopefully above where the onboard filtering rolls things off.  So, if there is a 220pf cap in there, scoring a 200pf cap as a substitute might alleviate some of the noise, without affecting effect intensity too much.

I think you understand exactly the type of noise I'm speaking of......as for power supply. I'm usng  a battery which to my knowledge is the quietest....Thanks for the advise...

zeeman