News:

SMF for DIYStompboxes.com!

Main Menu

Fuzz Mod??

Started by sevenisthenumber, June 10, 2008, 10:51:03 AM

Previous topic - Next topic

sevenisthenumber

I built a Shin Ei Companion Fuzz from GeneralGuitarGadgets.com. I love it but would like more volume.
How could I make the volume say, "unity at 12oclock" and above that boost?

Schematic = http://www.generalguitargadgets.com/pdf/ggg_secf_sc.pdf

Layout = http://www.generalguitargadgets.com/pdf/ggg_secf_lo.pdf

Thanks

petemoore

  It shows a 50k linear pot.
  I'd start by messing with the values on either side of the wiper.
  Putting more resistance between the wiper and ground, less resistance to pot input when the volume control pot is at center...will be louder than what a linear pots 50/50 resistance is.
  Consider a 'no-off-setting' stop resistor between pot and gnd., a 100k pot should sound a bit louder overall, perhaps some tapering resistor across the signal lugs...
 
Convention creates following, following creates convention.

sevenisthenumber

what will just putting in a 100k do?

sevenisthenumber



petemoore

 Turned Cw or Ccw all the way and the pot has 1 resistance, the other two lugs are connected.
  inbetween settings means there are two resistors connected to the wiper, when one goes up in value the other goes down.
  If you're setting is 50/50...equal resistances on either side, linear pot will be set center.
  Were talkin' linear here just because.
  You can stick tapering resistors:
  across lugs 1 / 2
  across lugs 2/3
  or reduce the pots total value by putting a parallel resistance to the wafer [from lug 1 to 3].
  A smalling of resistance to ground from signal path shunts more signal.
  A smalling of resistance in series with the signal path turns less signal into heat.
  All these will basically reduce the value of the pot, and change the R 'curve'..what makes knob sit 'here'.
  You can stick stop resistors:
  Between Gnd. and the pot will = greater resistance between ground and signal path, shunting less signal.
  Stop resistor in series with signal [through the stop R and the pots resistance], turns more signal into heat.
  These add a resistance 'outside' the pot [in series, emanating from lug 1, or lug 3], *increasing the overall pot value.
  I like to put a stop resistor on the ground side of volume pots so I can't turn it down all the way by accident, a possible debugging nightmare.
    *You can't increase a pots value with resistors, the range which the pot covers can be 'bumped up', but like my favorite vol. control mod which leaves it a little bit on when pot is fully CCW, you lose control over the range you 'added'...that's set now.
  put a 10k resistor on a 100k pot and you read 110k across the resistor circuit.
  the range of resistances available is now between from 10k  110k, there is no more 0.0 ohm through 10k  resistance available by setting the pot..jumper the stop resistor and you're back to a 100k pot...settings range between 0.0 ohms and 100k.
 
Convention creates following, following creates convention.