Vox - CT07DO Cooltron Duel Overdrive

kupervaser · Post by **kupervaser** » 08 Jun 2009, 14:18

I own this pedal: Vox Duel Overdrive.

I like this pedal so much, i would like to replicate it. I opened it up once and it is full of smd components.

Is there anyone who can help me trace it and make a schematic and a pcb layout and a component list?

I have never done this before, I could trace a simple effect but I think this one is a bit more complicated.

All I can deliver is some close up gut shots.

RnFR · Post by **RnFR** » 08 Jun 2009, 14:36

moved to modern.

kupervaser · Post by **kupervaser** » 08 Jun 2009, 14:47

Sorry, i am not used this forum yet. Thanx

lolbou · Post by **lolbou** » 08 Jun 2009, 17:01

Can you post guts? If it's crowded with SMDs, the through-hole clone will be bigger! And it's even more complicated if the stock PCB is double sided...

I did made a new PCB for a Laney LC15 which replaced all the SMDs, but it was quite spacy and single-sided...

Let's see?!

kupervaser · Post by **kupervaser** » 08 Jun 2009, 17:38

Hey I opend it up and actyally it is singlesided and doesn;t look really complicated, however i find it very difficult to track down.

Here are the pictures:

DWBH · Post by **DWBH** » 08 Jun 2009, 17:49

No, it's double-sided for sure. There are traces on both sides of the board.

kupervaser · Post by **kupervaser** » 08 Jun 2009, 18:03

Oh yeah like that, i see. At least there are components on one side!

cpm · Post by **cpm** » 08 Jun 2009, 22:19

dont forget the LED behind that tube!

kupervaser · Post by **kupervaser** » 09 Jun 2009, 07:00

Oh yeah exaclty, it has one of those blue leds behind the tube, looks fancy.

So what would be the procedure to convert this into a schematic and a new pcb + layout?

patafix · Post by **patafix** » 09 Jun 2009, 09:40

Looks like there is a lot of silicon in there for a so-called tube device...

The tube must be here to warm up the sound a bit...

Bernardduur · Post by **Bernardduur** » 09 Jun 2009, 09:42

cpm wrote:dont forget the LED behind that tube!

I was quite amused when I noticed the same trick in my Behringer Tube Mic Pre........ it was all part due to the tube btw; other tubes lit up as they should!

kupervaser · Post by **kupervaser** » 09 Jun 2009, 09:54

This pedal is actually 2 times VOX Big Ben Overdrive only with a bass boost.

I thought already that the tube isn't really doing any huge overdrives here. There is way too much gain in thi pedal to come from a tube.

kupervaser · Post by **kupervaser** » 09 Jun 2009, 21:34

Here you can find the schematic for the Vox Big Ben Overdrive.
I've been told that the Vox Duel overdrive is basically twice the big ben.

soulsonic · Post by **soulsonic** » 10 Jun 2009, 06:12

That power supply is intense.... runs on 6v battery, and then gets regulated down to 3.3v, and then boosted back up to bipolar +/-6v.
Lots of tricks in this one!