Vox V847 Wah - Adding an LED and True Bypass???

[ianvomsaal]

Vox V847 Wah - Adding an LED and True Bypass . . . HOW DO I DO THIS???
I've searched this forum, but can't find anything.
I have the 3PDT switch -- I have the LED (which is better 3mm or 5mm) -- what other parts do I need???
Thanks so much for all your help - Cheers . . .

- Ian C.T. vom Saal

[boogietube]

I have a diagram. E-mail me and I'll dig it up.
The diagram is for led, true bypass, power filtering and adding a power jack.
So, you might need some more components I think a 1k resistor, 220uf capacitor, 9.1v zener doide and a power jack.
Sean

[bleubleu]

Hi!

For all your Wah Mods, check this out : http://homepage.ntlworld.com/s.castledine/greenfuz/wah.html. I covers all kinds on mods including true bypass. The V847 one of the wah documented. Let me know how it turns out, I am going to modify mine aswell soon. Maybe turn in into a volume pedal aswell and add some more gizmos on it.

Mat

[ianvomsaal]

I couldn't find anything online dealing with this type of MOD (nothing exact) . . .
Thankfully I was contacted by a few people that were extremely helpful (even snail-mailing me diagrams for everything including how to add a DC jack).
I use a battery clip jumper so I didn't have to add the DC jack, but that option will be useful later on when I want to add one.

Anyhow, I did the TRUE-BYPASS/LED mod, and the pedal works fantastic -- sooo clean sounding now.
I used the WAH in our show last night (which was filmed for a music video for an upcoming vampire movie produced by John Landis).
The new modified VOX V847 works like a charm (thanks to a few kind gents -- I couldn't have done it without their help).

- Ian C.T. vom Saal

[boogietube]

I'm glad you got the diagrams!
I've been meaning to post them, but I don't have a scanner.
Very useful.

[slashedzero]

Sorry for bumping such an old thread, but I am trying to do the same thing as the original poster and I'm still (3 years after the original post) drawing a blank on Google. I'd like to upgrade my Vox V847 Rev B wah-wah (Made in USA, not one of the new ones) to true-bypass with LED (3DPDT) and add an adapter jack while I'm at it.

I've already made it true bypass with a standard Carling 2DPDT switch and added a battery-clip-to-adapter-jack cable and have been using it like that since. A built-in DC jack would however be handy and ESPECIALLY a LED, as I really need visual confirmation of the wah being off.

Any chance of the diagrams mentioned in this thread being scanned and put online somewhere?

Many thanks!

[jkokura]

http://www.wah-wah.co.uk/index.html

Jacob

[slashedzero]

That website does not give instructions to do a LED/adapter jack mod on a Vox wah. Only instructions there are those for a standard true bypass with 2DPDT switch, without led (I already have that). I need instructions on how to fit adapter jack (presumably with added "power regulation"?) and LED when I fit a 3DTDP switch.

[jkokura]

Well, the power jack I haven't had any experience with, but the LED you can do by following most truebypass wiring diagrams. You just need to pull power from wherever your wah is getting power. As for the power jack, I'm fairly certain that if you took some thinking to the 5th offboard wiring of the Tonepad site here: http://www.tonepad.com/project.asp?id=35 and the Wah website I posted above, I'm confident you can figure it out.

Just cause I'm curious, did you trying using Google to see if you can find any help out there?

Jacob

[boogietube]

Here's the diagrams. Something leaked in the latest move, but I have a scanner now.

http://i94.photobucket.com/albums/l86/boogietube/scan0007.jpg

http://i94.photobucket.com/albums/l86/boogietube/scan0008.jpg

One is the complete wiring, and the other is the little circuit for the power.

Enjoy!!

[boogietube]

I'd like to note that this is verified. I have done this mod many times.

[slashedzero]

Absolutely awesome!    Thanks a million!!

[butterblood]

Maybe a dumb question but I've just recently gotten into tinkering with some of my pedals and my V847 is my first victim. So I've got the 3PDT switch but I'm having trouble distinguishing the different posts on the actual switch in correlation with the numbered ones in the diagram?
Anyone?

[soupbone]

Here's the diagrams. Something leaked in the latest move, but I have a scanner now.

http://i94.photobucket.com/albums/l86/boogietube/scan0007.jpg

http://i94.photobucket.com/albums/l86/boogietube/scan0008.jpg

One is the complete wiring, and the other is the little circuit for the power.

I'm diggin' the coffe stains!LOL!Thanks,I was needing that diagram too!Awesome!!

[phector2004]

Align the 3PDT so the lugs are horizontal.

Pressing it will disconnect the top row from the middle row, and connect the middle row to the bottom row.
Pressing again will disconnect the bottom row from the middle row, and connect the middle row to the top row.

You can test this with a multimeter by checking the continuity between the middle row and the top/bottom rows when you switch.

Each pole (column) is isolated from the rest.

If you look at the schematic, you can trace the path of the signal. When it's bypassed it should be entering a middle lug from the input jack, passed on to another pole in the top or bottom row, and go back up through another middle lug to the output jack.

Hope it helps, good luck!

[ericthibeault]

Hello There,

I read BoogieTube's post and downloaded his scans about the wah filtering mod.  I went to my electronic supplies shop to buy those pieces but the guy asked me more specific things about thoses:
- 9.1v Zener Diode
  - (what wattage?)
- 220uf capacitor
  - (what voltage?)
- 1k resistor
- (what wattage?)

Also, seeking for that info elsewhere on Internet I found places where they put a .1uf capacitor in that section (http://i28.tinypic.com/15pialh.gif).  Can you tell me what this .1uf capacitor would do in that circuit and what voltage should be used?

Thanks for your answer,
- Eric

[boogietube]

9.1v Zener:
1N5239B
220uf cap: 16 Volts and above
1k resistor 1/4 watt metal film

[cjones5461]

On the schematic for the 9v circuit, the zener is in parallel with the cap but in the drawing I can't see which end of the diode is cathode and which is anode. I really appreciate you posting this, I've been googling this for ages.

[ericthibeault]

Hi,

You can see the standard symbol of the zener diode telling you the proper orientation of the diode.

I refer you to this website to clearly understand the relation of the symbol with the markings on your diode.
http://www.electronics-radio.com/articles/electronic_components/diode/zener-diode.php

Have a great time moding your wah.  It worked for me and I'm really please not having to put any battery anymore!
- Eric