OD2, removing fet switching

Started by Dimitree, August 17, 2009, 07:43:29 PM

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Dimitree

Hi everyone
I'd like to clean the OD2 schematic to reduce parts and simplify the building (btw I already have the original pedal).
I'm not sure if I can post the schematic, but it is easily avaible on the web.
I have some doubts, so, does anyone can confirm me those parts?

- C35 and R54 are removable? I believe that when removing the fet switching for the "turbo" mode, I can add a simple mechanical switch that connects the 2 different circuits directly to lug 3 of tone pot. Or do I need those 2 parts before the tone pot?

- Both circuit "end" at R48+C32 (bottom circuit) and R43+C26 (top circuit), right? If so, I could go from these 2 joins to the switch, and then to tone pot..

- C4 and C5 = remove one of the 2 or add them in series, so just one cap with half value?

really thanks
Dimitri

zeta55

Something like this?
I guess it might make "thump" when flipping SW1.


/Krister
Visit my site: http://www.zeta-sound.se/

Dimitree

really thanks Krister!
so C35 have to be there? is it a coupling cap, so not part of the switching circuit?
if so, why not do the same with C4 and C5, instead of removing one of the 2?

doesn't matter about the "thump", that switch is a "set and forget" switch I would say..

zeta55

As I see it C35 acts as a hipassfilter and a dc blocker.
C5 has to be there as a dc blocker for Q2:s bias.

/Krister
Visit my site: http://www.zeta-sound.se/

Dimitree

thanks again Kristen!  :)
just to understand better, why not keep C4 too?

zeta55

Quote from: Dimitree on August 19, 2009, 03:37:05 PM
thanks again Kristen!  :)
just to understand better, why not keep C4 too?

It serves no purpose since Q3 i removed.

/Krister
Visit my site: http://www.zeta-sound.se/