a folk red distorsion

[magnus290]

Hi!

I have never heard the dyna red or mighty red with my own rig but from what i heard on recordings and demos Im in love... the easiest way would be to order and just sit and wait (probably for a long time) or buy a used one.

But Gentlemen...the question we have to ask... would that be as fun as building your own???

I want to give this a try. I dont know if a trannie or op based version would fit best so I guess i have to try booth, but I would start ith the Op based one. I want to have a very dynamic distorsion but when its pushed harder I want it co get the compressed feeling to it.

I was thinking of using the OPA2134, a very neutral and low noice with high slew rate. Try to let the filters and clipping circuit do the sound. I was thinking about using a bax filter to get a aktive tone control, maybe with a stereo pot to adjust bass and treble at the same time. Maybe it would be better to cut a bit bass before the OP amp and then a passive treble cut to match the circuit. Dont know so Ill have to try.

I have some ideas about using 2 clipping stages, one in the feedback loop for smooth overdrive and the second one kicks in at higher gain. Maybe another idea would be to integrate a fet based compression that kicks in at higher gain levels to get a more compressed feling to it.

The idea would be
1. very low noice input stage, trannie or op based.
2. amplifying stage with filters and soft clipping in the feedback loop.
3. filters and a second clipping stage for more gain.
4 tonecontrol mentioned above
5 output stage with volume control , preferable direkt out from the OP amp.

Some question...
what is the normal input impedance on a circuit like this? And is it possible to get a really low noice input stage from a OP or is better to use a trannie?

Please gentlemen, join in... at least I hope it would be fun and interesting.....cause I hope that here is the right place to start a DIY forum with construction in mind and not just cloning....

Best regards Magnus

[Donner]

This could be fun and educational !! Maybe even another Kit project after the Folk Fuzz is done .... or along side,,,,

[BJF]

Hi,


Very cool Magnus,

I'm in

Have fun
BJ

[magnus290]

Hi!

If Ill get somthing that is useful then well get another diy project if there is any interest. Or maybe not since i am one of the guys here that dont build pedals for a living... (all help and ideas is useful)

Thanks bjorn... I guess Ill be needing a word or 2 (thousand) from you

I think Ill have to make a first design so we have something to talk about first. I have a couple of ideas but i dont know i they are useful in the real world or if they just should be left deep inside my sick fantasy....

Ill try to get some time to write in a day or two

// Magnus

[magnus290]

Ok guys. Here is what i have Been Thinking about for some time now. An overdrive like circuit with smooth led or fet overdrive that distorts by a second stage at higher gain levels. If I match the levels I think I will cover a quite wide sound range from some overdrive to hard distortion. A lot of work has to be done on the filters so that I will have the right frequeces at the 2 clippingstages. Then an active eq to mess the sound up. . I think that I am out in deep water. Don't have a clue if this can work at all. But I will draw a layout for it. Have to get values for the components first.

Hope this will work with the schemmo. First time to post.

Ok here it is. My shot at the title. (or just a ruff idea)



hope the foto works

// magnus

[Donner]

sounds like a cool one.... photo link seems broken from here....?

[mills]

My two cents... allthough this is pretty much my catch all solution to distortion... unless you're really wanting an active post clipping filter, I'd stick a passive lowpass in front of the clipping stage, and the treble after. Maybe a simple buffer out front with the other half of the op amp (or a high control if we want active shaping after the drive).

Get a few feels for the distortion, rather than changing the bass after. Also, I kinda like a simple passive lowpass. Its not exciting, but it sure is good at what it does.