Craig Anderton's Antiwah: How good it is?

[zener]

I've seen the Antiwah circuit and to my surprise, it doesn't have an inductor. Only two op amps. Anyone who has built this one? How good it is? It is good as those that sounds like human voice, as in waaaaaah! I want something that sounds like what Jimi Hendrix or Kirk Hammet uses. Too bad it's hard to find an inductor here.

Thanks for any help  

Zener

[Paul Perry (Frostwave)]

Zener, if you like experimenting (!), you can try small transformers as inductors. Just try on winding at a time, ones from old modems & very old transistor radios are worth a try. I don't know whether anyone has ever tried small power supply transformers..

[maarten]

Well, I have buit the antiwah, but I can't say I was impressed with it: to me it was less than a Wah with an inductor. The best wah I made used 3 or 4 OTA's (CA3080) in a row - the scheme is somerwhere on Internet, I think I found it at the site of one of the synthesizer-people.
Maarten

[Mark Hammer]

The Anderton Anti-wah uses two simple bandpass filters, identical to what he uses in the Bi-Filter Follower, and close to what many other schems on the net use for a similar purpose.

What will determine the pleasingness of this design in your own ears will more likely stem from the resonance/gain of the filter sections (easily tweakable) and the action of the pots.

Part of the trick is in establishing the optimum relationships between centre frequencies in the filter sections, and for that the relative resistance value of each foot-controlled resistance will be important.

I am certain it will sound interesting and musically useful to you, but I am just as certain you won't necessarily like what you produce with it before fine tuning.

[Jim Jones]

Hi zener,

I don't have any experience with the Anderton circuit, but I can say I believe you can build an excellent wah without using an inductor.

The Ibanez WH-10 is an "all op amp" wah and it sounds fantastic - and to my ears - more "classic" sounding than a new Crybaby.

Jim

[Ansil]

Hi zener,

I don't have any experience with the Anderton circuit, but I can say I believe you can build an excellent wah without using an inductor.

The Ibanez WH-10 is an "all op amp" wah and it sounds fantastic - and to my ears - more "classic" sounding than a new Crybaby.

Jim

hey jim.. that is because there hasnt' been a decent crybaby in 20 years

[zener]

The Ibanez WH-10 is an "all op amp" wah and it sounds fantastic - and to my ears - more "classic" sounding than a new Crybaby.

Jim

Is there a schem somewhere?

Thanks.

Zener

[Arne]

Hi Zener
Why don't you try the wha-filter at Stellans schematics,
i have build it and to me it sounds better than my old wox wha wha.
it's an easy build, it's not so many parts, it has a switchable filter, the only drawback is that you have to use a bipolar supply, i used two 9 volt batteries and it works fine.
Arne

[zener]

Hi Zener
Why don't you try the wha-filter at Stellans schematics,

Isn't it just an autowah? Something that goes along while you play?

Zener

[Paul Perry (Frostwave)]

Most autowahs (or indeed envelope followers!) can be converted to wah use, by replacing the resisor in question by a pot, or by generatign a control voltage from a pot across the battery & runningthat in where the controlling voltage would go.
In fact, an ecternal control voltage input, would be a very nice mod for the Nurse or Dr. Quack.

[zener]

According to Paul Perry, autowah can be converted into a wah pedal? What are the basic mods to it? Any schem out there of autowah converted into a wah pedal?

Thanks for any help.

Zener

[ExpAnonColin]

Mmm... I was hoping to find some simple high-q bandpass filter schematics on this thread... no such luck.

-Colin