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.

Just trying to see what year. Its the best sounding one ive heard.

Schematic and Component Layout 1977

Noise Gate 001.jpg Noise Gate.jpg

Are those MC4017D BBD chips entirely new design or a replica?

As the title goes, is Phase 90 = EVH Phase 90? What is the mods presents in EVH version?
Appreciated if anyone could share....:)

I know there's already a couple threads about this pedal and the classic distortion but I'm looking for a mod to this pedal to add some more drive. I'm not looking for something to play death metal or anything like that....just a little heavier distortion than it offers stock. Any suggestions? Thanks!

Schematic & Finalized parts list -- UNVERIFIED

VR1: A250K (Gain pot)
VR2: B10K (Tone pot)
VR3: A10K (Level pot)

D1: 1N4001? (black diode)
D3, D4: 1N914? 1N4148? (I assume D2 is the power LED)

R2, R3: 10K 5% carbon film
R4: 1M 5% carbon film
R5, R11: 1K 5% carbon film
R6: 10M 5% carbon film
R7, R8: 21k5 1% metal film
R8: 2.15K 1% metal film
R9, R12: 1K 5% carbon film
R10: 220 ohm 5% carbon film
R13: 6.81K 1% metal film

C1: 1000uF 25V electrolytic, polarized radial (Xiahui)
C2: 10uF...

How does one ascertain which trimpots to tweak? The PDS1700 Chorus Flanger has 4 and I would like to try and get it sounding a little wackier and figured trimpots could be the go

what are the differences between the DC-2 and DC-3? is the 3 not bbd based?

Pesocaster unexpectedly came through and emailed me the schem today, so I get to finally contribute something! For your viewing and possibly layout-making pleasure, the factory schematic for the 903:
bluetube.png

And in case you don't have the Real Tube schematic for direct comparison here's that:

Enjoy!

I missed this change, i liked the sound and now that they eliminated the loop and the tube its probably very clonable

can someone crack the plexitube/london bone. no bs tube tone in the new version.

I bought a CS9 w/o a label in a pawnshop, and i have no idea if the CS9 is a reissue or original.

The board says maxon, and has MN3207, MN3102, TL022CP IC's

Thanks guys.

Does anyone have the schematic or service manual for this?

sorry if this is posted in wrong place......looks wery interesing (to me)....
...so does enyone have schematic or better pictures? ..this thing have tape flanging also!!!

boris :block:

Hi Folks, I've just signed up this very day.. aaah...

In at the deep end, then. My speciality is repairing vintage keyboards but I do like nice pedals and have repaired the odd one or two.

My current problem piece is my cheap'n'cheerful ebay Microsynth. It's the early version with built-in mains transformer and I really need a suitable schematic for it. The ones available on the net are appropriate for the later/current version and there are so many differences that it's not really helping...

I recently stumbled upon this which looks interesting, does anyone have one or know how this works or have a layout? If it were any good I'd probably fit one in my guitar to save space on the pedal board.

Hi All!
I wonder: Why are there 6 Transistors in my OD808 ?
There is just a 2DPDT in it. I cant find a Schematic. :scratch:

I Hope Link or Image works ...(first try in a Forum)

Does anybody Know?

I just nabbed one of those NOS units on fleabay. Is the re-issue board also feature the goop 'module'? I haven't been able to find any pics of the inside of the re-issues. No biggie, just curious. I'll post pics when it gets here if anyone needs it, but I'm pretty sure this one's been laid bare by now. Creepy Brad builds a mean Scrambler clone.

:mrgreen:

Another soundtank of which the circuit diagram still seems to be absent of the surface of the planet. Not anymore. :D
When starting the reversal process I more or less expected to see some resemblance to the classic envelope filters like the AFL, AF9 or older. Not exactly the case up to the point where I could copy/paste the whole filter section of the 2nd generation WH10 wah into the circuit again. Funny since the designers of this box also used that same filter in the CD5 Cyberdrive.

Nuff...

I ordered the tonepad pcb's for this and now in the process of ordering the remaining parts. Can anyone recommend a capacitor type that is commonly used here? I see a lot of folks using the square box types but I haven't been able to locate those. They may not even be a good fit for this particular build.

Also, is it worth paying the high price for a NOS MN3007 chip or will the new production cheap ones work just as well?

Thanks
Rut

Anyone got any info on this one (guts, schem, review, sound samples, etc.)?

I remember a friend had one when I was younger, and it did strange modulation like a flange, chorus and phaser all at once.

Hey guys,

here's the guts of my '79 EH deluxe mistress...

Not really working (bought used), but still trying some repairing: I want to tame her... I think an adapted PCB can be found somewhere (geofex?), but I thought this might be a good place to post these pictures (forn porn addicts)...