Jfet gate ?

[jneely]

Hello Again

I have a three stage jfet circuit on the breadboard. When I play through it with humbuckers it gets a little over driven. I tried series resistance at the gate but changed the sound of the pedal too much.

Is there anything else I can try? I also changed the imp resistor and messed with bias but all changed it too much.

I'd rather not have to ride the vol control full time.

Thanks
Jeff

[Brian Marshall]

unless they are just buffers, 3 gain stages in a row with only 9 volts of head room will usually have some clipping when driven hard.... hell even a typical jfet buffer can boost a little bit.  multiply that by 3.

why do you need 3 jfets if you want clean?

[Lonestarjohnny]

Jeff, Try some lower gain J-fet's for your Humbucker's, look at all the Sub's and pick you out some lower gained one's, it'll mean you will have to rebias the new fet's but if you used trimmer pot's on them, it'll be a no brainer, I built a 3 stager for a buddy of mine with lower gain J-Fet's and put the right tone control to it and now His L.P. sounds super sweet with the Mid range boost I added to it, he say's it even spank's now and bites harder, you just got to try a few different Sub's, you'll find the combination,
JD

[jneely]

If you guys pop over to the jfet circuits page at general guitar gadgets you'll see not only the "original" mini-booster but also a jfet 360 degree phase circuit. http://www.generalguitargadgets.com/fet_an_32.pdf

I used this to make kind of an active varitone in a box. It works really well aside from the breaking up. It's not that I don't like the over driven sound I just wanted to know if I could get it out.

I made some mods to this circuit for gain. I used a fixed resistor in between the second and third stage in place of the pot so that it would always sound slightly out of phase.

Thanks for the help
Jeff