Output Buffer Ckt For Wah

[Paul Marossy]

Well, since my humming vintage ckt brd just doesn't work with my rig, I modified my CryBaby by changing four resistors and one cap. Boy does it sound hugely improved! Anyhow, I was thinking about putting a output buffer on it. Does anyone know of a place on the web where I can find a schematic that shows how to wire an output buffer for a wah pedal?
Thanx for the help, as always.

[Paul Marossy]

I hope my first post wasn't confusing... I modified my brand new GCB-95 circuit to make it sound a lot better. I would like to put an output buffer on it for use with my Fuzz Face. I looked at AMZ's Basic Buffers article, but it looks like those are all intended to be input buffers. Can I just use one of those jfet buffers and get rid of the resistor to ground on the input of the buffer? I am thinking that should work, but would like a second opinion or two. :wink:
But then I think that the output buffer should be somewhat of a preamp...
Anyone done this before?

[petemoore]

The Tubescreamer article at GEO...just for the application reference on the output buffer of the TS.  That ckt segment [there's a separate subarticle on each segment of the TS] could probably be hacked in and would be suitable for most applicable output buffers here.
 Im wondering now what the differences/needs are between input and output buffers...
 there's other output buffers to look, lurking within some chosen schematics...use a copy of the AMZ and TS buffers...look [at different schems] for a last transistor with the signal coming off the emitter...they should look soemthing like the AMZ or TS buffer's'.

[RDV]

Paul:

Let us know how this one goes. I failed miserably at finding the right BUFFER  gain structure to make the wah work with my FF. I built the buffer from GGG and it just didn't help a lot. It's a good signal buffer, but the FF still sounded weird. The one FoxRox makes is supposed to work, but he's not telling how he does it for obvious reasons($$$$).

Regards

RDV

[Paul Marossy]

I did see the Tube Screamer schematic, I remembered that it has an output buffer. I suppose I could hack that part of the circuit, but I don't know that I need to have a voltage divider (Vref) and all that stuff.

I saw that Stuart Castledine makes an output buffer for a wah ckt, too. That's were I got the idea to make my own. It can't be that hard to do....

There's one at GGG? Where is it? I looked for something like that on JD's site, but didn't see anything. Maybe I'm looking in the wrong place...

[RDV]

It's just schems for various buffers.
http://www.generalguitargadgets.com/v2/index.php?option=displaypage&Itemid=100&op=page&SubMenu=
Regards

RDV

[Paul Marossy]

Thanks for the link.
So did your circuit not have enough gain, or too much?
Which one did you build, transistor or jfet? Which transistors did you try?
I think I am going to try the jfet one and use trimpots to control the gain.

[ErikMiller]

Paul, I'm curious as to what resistor and cap values you used on your GCB-95. I'm way into coming up with a set of good mods for those things.

[RDV]

I probably gave up before I should have. I used the transistor version, which seemed to be around unity gain. To my ears though, the FF still sounded strange. I then built the Rocket, which loves the wah-wah, and have pretty much left the standard FF behind.

Try the JFet and let us know how it goes.

Regards

RDV

[Paul Marossy]

I've been thinking about it a little bit the last couple of days. I think it would have to actually be a preamp more than a buffer, or maybe a preamp with a buffer.

Funny, if you look closely at the FoxRox circuit pictures on their site, it looks like they are made on perfboard with some shrink wrap around it...

[gdmart]

Hi,
Im new here,great info.
I bought a buffer for my modded vox wah from foxrox,you know the captian coconut pedal guys?? it has fixxed my wah/fuzz face woes completely.It lets both pedals work as they should     fyi

[amz-fx]

Does anyone know of a place on the web where I can find a schematic that shows how to wire an output buffer for a wah pedal?

Check out the "Basic Buffers" article at http://www.muzique.com/lab/main.htm

-Jack