Rodent problem with 'drive' pot.

Started by swid, July 07, 2006, 01:23:47 AM

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swid

So, I just built a Rodent using the GGG PCB and layout, and it seems to work in every regard except that the drive pot seems to do very little if anything except shut off all sound at around 90%-100% up.  This seems like it would be an obvious problem to fix, but I'm fairly new to this, and wasn't able to come up with anything obviously wrong.  I looked at the wiring several times to make sure it was okay, and it looks consistent with the parts layout on GGG (I'm sure I'll look this over again and again, though).  Any ideas?  Any obvious places in the circuit I should look?

Seljer

turn arond the 2 outer wires, its been wired the wrong way so it acts as if its got a reverse log taper to it, I did this too...twice actually :-\

edit: just remembered that there ARE only 2 wires on the thign...just mirror it if you get what I'm saying

swid

So, is the layout diagram on GGG wrong?  In addition to the two wires connected to the drive pot, it shows a wire connecting lugs 1&2 -- should I mirror the whole thing, so that lugs 2&3 are connected instead?  Thanks!

petemoore

  I wasn't sure what you mean with
  the drive pot seems to do very little if anything except shut off all sound at around 90%-100% up.
  if the gain is adjustable, but only on a small portion of the potshaft range adjustment, it sounds like it's the 'ol wrong pot for that knob to work 'right'...smoothly.
  I really doubt there's an error on the Rodent, I'd check again to see if there's a pot designation for that knob.
Convention creates following, following creates convention.

swid

I'll definitely double check that when I get home, but I'm fairly certain that it is a 100K log taper wired up exactly as shown here: http://generalguitargadgets.com/diagrams/rodentpl.gif

swid

Update -- everything was wired like the diagram, but I mirrored the drive pot wiring, and it seems to work fine now.  That is weird.

Solidhex

Had to mention I just built the rodent and experienced the exact same thing. Wired up like the diagram the pot acts backwards. Turned all the way clockwise at the final 90% of the rotation the sound shuts off. I switched the wires and it did the same thing. Luckily I checked this post and connected lugs 3 and 2 instead of 1 and 2 like the diagram. I'm thinking the diagram is wrong... It sounds pretty huge now though.

--Brad