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DIY Stompboxes => Building your own stompbox => Topic started by: sevenisthenumber on March 17, 2011, 05:38:54 PM

Title: More Drive / Dirt to a runoffgroove Uno?
Post by: sevenisthenumber on March 17, 2011, 05:38:54 PM
Anyone know how I can saturate this a bit more with a simple change in the circuit?

(http://www.runoffgroove.com/uno.png)
Title: Re: More Drive / Dirt to a runoffgroove Uno?
Post by: Steben on March 17, 2011, 05:41:57 PM
lower supply voltage  :icon_mrgreen:

4 full gain j201 jfets ... and not enough saturation?  :icon_eek:
Title: Re: More Drive / Dirt to a runoffgroove Uno?
Post by: CynicalMan on March 17, 2011, 06:18:25 PM
(http://www.redmolotov.com/images/designs/turn-it-up-to-eleven-tshirt_design.jpg)


Maybe increase the 220k resistor? Or build a Dr. Boogey instead. ::)
Title: Re: More Drive / Dirt to a runoffgroove Uno?
Post by: petemoore on March 17, 2011, 06:43:43 PM
  Many ways to skin it.
  The speaker sim/multi pole filter at the end will shave off HF's these are often associated with grit of finer dirts.
  The 22uf emitter bypass caps bring gain up and change the sound, an alternative would be preboost and lose some of the AC gain-bumping capacitors...also:
  Did you fiddle with measureing Jfets in order to calculate bias for 'these' [larger batch to choose from or different batch of...read Fetzer article to understand more about biasing jfet @9v.
Title: Re: More Drive / Dirt to a runoffgroove Uno?
Post by: sevenisthenumber on March 17, 2011, 11:22:46 PM
Quote from: Steben on March 17, 2011, 05:41:57 PM
lower supply voltage  :icon_mrgreen:

4 full gain j201 jfets ... and not enough saturation?  :icon_eek:

I want to get a more modern santana type tone from this.