Roger Mayer - Voodoo Axe

Nyquist5 · Post by **Nyquist5** » 04 Dec 2008, 10:11

I traded it for a crappy chorus. It sounds pretty good and FF-like with a pronounced top end that doesn't get brittle, although it may not be everyone's cup of tea because of it. It sounds particularly nice with single coils into a 70s Marshall Superlead type amp.

It is basically an Axis Fuzz with an input buffer and a BMP style tone contrl (fatness). I haven't traced the Axis Fuzz part as it's easily found on the net. Sorry for the crappy quality (not much time + bad scanner)

:
http://nicosonic.free.fr/pedale/Voodoo%20Axe.jpg

If anyone has the schem for a DOD460 mini-chorus, I'd be interested

analogguru · Post by **analogguru** » 04 Dec 2008, 10:54

Is there no output buffer like in the voodoo-1 ?
The input bias divider looks a little bit odd, but it will be working.

If anyone has the schem for a DOD460 mini-chorus, I'd be interested

I am missing some component values therefore I didn´t release it yet - do you have one for the misisng component values ?

analogguru

Nyquist5 · Post by **Nyquist5** » 04 Dec 2008, 13:34

You are right. I should have posted this when I traced it, not a month afterwards...
So, what I indicated as the input buffer, is actually the output buffer driving the 2 outs in parallel. Compared to the Voodoo-1 schem, it is very similar to its output buffer, only 1 resistor is different (470k). This buffer is always in the signal path. There is also an input buffer, which I have added now.

I also have a DOD 460. Let me know which values you need.

I can post pics of both in the near future but not until next week.

I spend ours fussing about with an amp's response but I can't get myself to spend 15mn tracing a pedal properly...

Nyquist5 · Post by **Nyquist5** » 08 Dec 2008, 19:04

Here are the RM Voodoo AXe pics. Traces can be clearly seen through the board

http://nicosonic.free.fr/pedale/RM%20VA1.jpg
http://nicosonic.free.fr/pedale/RM%20VA2.jpg

gajaorange · Post by **gajaorange** » 15 Jul 2009, 07:55

Can you tell me which transistors Voodoo axe use exactly ? Thank you so very much !!!

gajaorange · Post by **gajaorange** » 17 Jul 2009, 02:01

Here is full schematic traced from pictures above...transistors is unknown yet....If somebody know which transistors is in , it would be very helpfull.....P1 is also unknown...I guess 2k linear ,like in axis fuzz...P2 must be 100k linear....
According to Roger Mayer from his site voodoo axe have highest output of all of his effects, which means that P3 must be 100k log...I guess so....

analogguru · Post by **analogguru** » 17 Jul 2009, 05:46

Dear boris? "gajaorange" from Belgrade,

even when you try to imitate my schematic drawings perfectly it doesn´t reach the necessary quality. The reason is simple - your drawing contains:
1 mistake
3 missing symbols
and at least 3 unverified component values - beside those you already stated in your posting.

Maybe this could be the reason why you didn´t put your name on it like I do ?

analogguru

Nyquist5 · Post by **Nyquist5** » 17 Jul 2009, 06:54

From memory, the "Axis Fuzz" transistors are 2n3906 and 2N3904, and the input buffer transistor is BC549C.
P2 is indeed linear and P1 is 2,2k.

I don't have the pedal at hand but I can check within a few days.

analogguru · Post by **analogguru** » 17 Jul 2009, 07:12

I doubt that Q3 is a 2N3904.

analogguru

gajaorange · Post by **gajaorange** » 17 Jul 2009, 12:35

Analogguru, your schematic are by far the best and most beautiful of all the schematics on the Internet , so I use your drawings.

You can redraw if you want, without the errors of the drawing that I made...That I would like to see, of course

I am from Novi Sad , not from Belgrade...And my name is not Boris

gajaorange · Post by **gajaorange** » 17 Jul 2009, 12:56

Ahaaa I know what you mean... Here is the redrawn without mistakes...I guess so

Thank you analogguru !

Roger Mayer - Voodoo Axe [schematic]