[806] Wah/Antiwah mod

Date: November 5th, 2010 | Comments : [7] | Categories: DIY.

Wah anti-wah

This is the Anderton Wah/Antiwah that I have modified to work from a single 9v battery. The original project required two batteries to power it. Other components have been added to bring the design up to a modern standard. Click the above schematic for a full size drawing.

If you build this version, and use an external power jack, I would suggest that you power it with 12v or even 18v to get some extra headroom.


7 Responses to “Wah/Antiwah mod”

[1520] brenton Says: 8:36 am, November 7th, 2010

what is the equation for calculating frequency centers in this circuit?

[1527] Guitar effects pedals Says: 8:56 am, November 14th, 2010

Sounds interesting. Im familiar with Wah but what does an Antiwah pedal sound like and who uses them?

I retail effects pedals for guitar and would like to add this to stock.

[1528] admin Says: 9:45 am, November 14th, 2010

It has two wah filters, and as you move the pedal, one filter goes up in frequency while the other goes down.

You can lift the end of the pot tied to one of the filters, and it will act as a normal wah. I will post this mod when I get a chance to draw it up.

[1532] brenton Says: 4:14 pm, November 17th, 2010

nvm.. your post cleared it up. adjusting the pot will change the negative feedback loop in both sections, adjusting the frequency sweep in both simultaneously in opposite directions of the spectrum.

[2093] Robert Edwards Says: 3:45 am, March 6th, 2011

Hi – what range of cap values can be used? Your schematic suggests 1n to 5n in pairs, that’s a very small range. I know, I should find the time to breadboard it myself, it looks like fun to experiment with this one ..!
Thanks for your help, Rob

[2865] Christian Says: 10:41 am, April 26th, 2012

I really like this and I think it sounds pretty cool, but I have a question, I’d like to add a switch for turning one side off, making it operate like a normal Wah, where would I put this switch and?

[2874] admin Says: 7:19 am, May 2nd, 2012

To use as a single wah you would just break the connection after one of the 1k resistors on the opamp output (either one). You could put in a switch there to toggle the wah from single to dual filters.



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