RM Voodoo 1 question

Started by Greg, March 03, 2005, 05:52:50 PM

Previous topic - Next topic

Greg

The schematics I've found for this pedal say that the value of the pots is unknown. Has anybody determined the values since those schematics were originally put up on the internet?
Thanks,
Greg

Pedal love

Greg, its been a while since I owned one, but I think the gain & tone are 100k and the volume is 47k. tfc

Rob Strand

Some time ago I made these notes regarding Justin P's schematic:

"The following values look feasible but
have NOT been checked against the original circuit:
- Caps: what I think what's really happened is 100 means 100V
 and the cap values have not been recorded!
 Another possibility is the 100 caps in tone control section should be 10nF.
- the 70k resistor should be 10k

My guess is that 100kpots would be a good start.
Maybe a 50k for the drive pot."

The justification for the 100k output pot is that this matches the impedance of the big-muff buffer.  For an closer muff match the tone controls treble cap would be 3n9/4n.  Alternatively with 10n on the tone control's treble cap the 47k output might make it more muff like (but it's not a match) on the treble side but not on the bass side.

This is all *educated guess work* but the main point is the pots aren't the only thing in question on that schematic.
Send:     . .- .-. - .... / - --- / --. --- .-. -
According to the water analogy of electricity, transistor leakage is caused by holes.

Greg

Aw crap! Well, I guess I'm just going to have to buy this one. I don't particularly want to be doing guesswork with it. Thanks guys!
Greg

eaze

Additional information.

It's incorrect.
http://www.geocities.com/j4_student/rmvoodoo.gif

As for all Voodoo series,
When FX-ON or FX-OFF, both pass along the same output-buffer.

Buffer (emitter-follower) should be located just before OUTPUT jack.
The path of "FX-ON" does not contain that.

and,, the feedback-loop thru 1.6M is funny.