playas
Well-known member
There are lots of wah schematics out there but I can´t locate one for that particular model.
Alternatively is anyone familiar enough with the different models that knows what the parts values are?
I´ve already Googled this and searched before posting (but the search function isn´t working).
What I´m looking for is a schematic for my Dunlop wah wah before I start modding it - once some parts arrive in the post.
If I can´t find one it´s not the end of the world as there are other dunlop schematics although definitely slightly different, as well as schematics for Vox / Clyde McCoy style wahs.
I imagine mine is similar to the other GCB-95 schematics I´ve found but without the extra (input buffer? - I´m no expert) section that aren´t in the Vox style wahs. Without that extra section it seems to be a fairly standard design apart from value changes.
My overall plan is add a few trim pots (or at least to replace the existing Q resistor) and also try to get a closer approximation to the general sound of a vox style wah...but I´ve no idea what the stock cap values are in my own as a starting point. (Apart from 2 electrolytics that look like 100uF and 2.2uF)
The transistors look like they may be 2 x ITT3904 rather than the 1x MPSA13 and 2 x MPSA18 in the other dunlop schematics I found. I have a few BC109s lying around that I can replace them with but I don´t think that´ll be necessary and will stick with one change at a time in any case.
Here´s a link to the closest dunlop schematic I´ve come across
http://fuzzcentral.ssguitar.com/schematics/crybaby.gif
What I am guessing is that most of the circuit before the 68k resistor 0.01uF pair leading to the base of the first MPSA18 is what is missing in mine.
If worst comes to worst I will sit down and try and figure it out by following the PCB traces and assuming the cap values correspond to the schematic in the link, but that seems more prone to mistakes.
Alternatively is anyone familiar enough with the different models that knows what the parts values are?
I´ve already Googled this and searched before posting (but the search function isn´t working).
What I´m looking for is a schematic for my Dunlop wah wah before I start modding it - once some parts arrive in the post.
If I can´t find one it´s not the end of the world as there are other dunlop schematics although definitely slightly different, as well as schematics for Vox / Clyde McCoy style wahs.
I imagine mine is similar to the other GCB-95 schematics I´ve found but without the extra (input buffer? - I´m no expert) section that aren´t in the Vox style wahs. Without that extra section it seems to be a fairly standard design apart from value changes.
My overall plan is add a few trim pots (or at least to replace the existing Q resistor) and also try to get a closer approximation to the general sound of a vox style wah...but I´ve no idea what the stock cap values are in my own as a starting point. (Apart from 2 electrolytics that look like 100uF and 2.2uF)
The transistors look like they may be 2 x ITT3904 rather than the 1x MPSA13 and 2 x MPSA18 in the other dunlop schematics I found. I have a few BC109s lying around that I can replace them with but I don´t think that´ll be necessary and will stick with one change at a time in any case.
Here´s a link to the closest dunlop schematic I´ve come across
http://fuzzcentral.ssguitar.com/schematics/crybaby.gif
What I am guessing is that most of the circuit before the 68k resistor 0.01uF pair leading to the base of the first MPSA18 is what is missing in mine.
If worst comes to worst I will sit down and try and figure it out by following the PCB traces and assuming the cap values correspond to the schematic in the link, but that seems more prone to mistakes.
