Can more gain be had from this?

[nee]

Greetings all!

This is a simple circuit I cobbled together from various ideas. I really like the sound of it, but was wondering if anyone can see a simple way of increasing the gain of it (i.e. just a little more overdrive/distortion) without destroying what is already there.

http://www.cabana.net.nz/graphics/Tui2.jpg

Many thanks!


IanG

[Jered]

  What does the wiper on the boost pot connect to?

[composition4]

I think he meant to draw the gain pot as a variable resistor -with the wiper going to ground, the other end of the pot left open. i.e. AMZ mosfet booster

I can't give any real suggestions to help OP though, only just beginning to understand a lot of things myself.    I would think you might want to add another gain stage for any more (decent sounding) distortion than you have, but it may change the character of the circuit

I'm sure someone with more knowledge can make a better suggestion

[R.G.]

This is a simple circuit I cobbled together from various ideas. I really like the sound of it, but was wondering if anyone can see a simple way of increasing the gain of it (i.e. just a little more overdrive/distortion) without destroying what is already there.

Change the ratio of the 68K and the 10K between the drain and +9. More resistance on the 10K side is more raw gain. The "bass cut" switch is actually a treble cut switch, works by changing the loading on the guitar driving this. It will not work with a buffer in front of the circuit, only if the guitar goes directly into the effect.  As shown, you have confounded the biasing with the gain by strapping the biasing resistors to the junction of the 68K and 10k. It's more parts, but a separate bias divider leaves you the freedom to change the gain by changing the 68K and 10K in any ratio. Right now, the bias changes with any changes in the two drain resistors.

[nee]

As shown, you have confounded the biasing with the gain by strapping the biasing resistors to the junction of the 68K and 10k. It's more parts, but a separate bias divider leaves you the freedom to change the gain by changing the 68K and 10K in any ratio. Right now, the bias changes with any changes in the two drain resistors.

R.G. - Thanks; this is exactly the kind of theory I was looking for in my attempt to understand just exactly what it is I've built!

For a biasing divider would I replace the "bass cut" resistors with a single resistor, and add another to ground from the junction of that resistor and the guitar signal path? Or would the "upper" resistor of the divider come from "below" the 10K?

If it's not too much trouble, would you be able to explain the theory of the 68K/10K divider on the 9V line? I can't remember where I got the original idea, and most boost/overdrive designs seem to dispense with the 68K.

(And yes, that 5K wiper is meant to go to ground - still getting the hang of the fang-dangled schematics application.)