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PostPosted: Fri Mar 07, 2014 10:30 pm 
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This is a fun circuit. I always liked the original ROG Phozer's base sound, but the LFO wasn't really that useful at lower speeds. So I took the basic idea, which is the Idiot Wah + LFO, and kicked it up a notch. Instead of the Phozer's input JFET buffer, I went with an op amp buffer, and since there's an extra amp in the package, I also added an output buffer. The LFO is the same one I've been tacking on to everything the past couple years (from the STM). For the variable resistor element, I went with the H11F1 opto IC. But a vactrol or LED/LDR would also work very similarly.

It's not a phaser. It's not a vibe. It's not a tremolo. It is.....sort of just like a smooth wah (no inductor) with a mildly choppy LFO. I suppose it's most like a phaser with a dash of trem, but it's really not all that much like any commercially available modulation. Which is probably a good thing. :lol:

This was something I drew up and hoped worked when I ordered the proto board. And it does work quite well. Surely there are many mods and tweaks to be made to improve, extend, or expand the tones available. I offer this working, fun, useful circuit to the community to experiment with and renovate. Can't wait to see what you guys do with this. :D

I will try to get a sound clip posted over the weekend.

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Last edited by culturejam on Sun Mar 16, 2014 6:56 pm, edited 2 times in total.

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 Post subject: Re: The Wahscillator
PostPosted: Fri Mar 07, 2014 10:41 pm 
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Forgot to mention:

The "Bias" trimmer is to set the max resistance value of the opto-isolater. This allows for some "tuning" of the sweep of the LFO.

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 Post subject: Re: The Wahscillator
PostPosted: Sat Mar 08, 2014 5:14 am 
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You should have saved this for the holiday season. You know, so we could all go "a-wahscilling" :lol:

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I want Pterodactyl sounds dammit, not a nice little analog sustain.


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 Post subject: Re: The Wahscillator
PostPosted: Sat Mar 08, 2014 8:06 am 
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CaptainPeyote wrote:
You should have saved this for the holiday season. You know, so we could all go "a-wahscilling" :lol:


Yep, you could've sung "Awah in a Manger......"


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 Post subject: Re: The Wahscillator
PostPosted: Sat Mar 08, 2014 10:30 am 
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I did a layout with most of the LFO passives and the power filtering/vref resistors as surface mount parts.

Attachment:
Wahscillator-V1-1-pcb.png



Kinda messy, but it sounds pretty neat. 8)


Attachment:
wahscillator-popd.jpg

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 Post subject: Re: The Wahscillator
PostPosted: Sat Mar 08, 2014 5:00 pm 
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Any chance of a demo? I'm VERY interested in this

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 Post subject: Re: The Wahscillator
PostPosted: Thu Mar 13, 2014 7:13 pm 
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Here's a quick/dirty demo:

https://soundcloud.com/effdub/wahscillator-quick-demo

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 Post subject: Re: The Wahscillator
PostPosted: Thu Mar 13, 2014 9:09 pm 
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sounds great! diggin' it.

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I want Pterodactyl sounds dammit, not a nice little analog sustain.


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 Post subject: Re: The Wahscillator
PostPosted: Thu Mar 13, 2014 9:21 pm 
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Gotta do another demo now. I just tried a small Silonex vactrol in place off the H11F1, and wow is a way better. Much more full sounding sweep and overall more prominent effect.

Should work similarly with the typical LED/LDR pair.

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 Post subject: Re: The Wahscillator
PostPosted: Thu Mar 13, 2014 9:37 pm 
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Nice. Reminds me of the Gristleizer.

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 Post subject: Re: The Wahscillator
PostPosted: Thu Mar 13, 2014 9:46 pm 
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Just did another quick test. Sounds about the same as the vactrol, or maybe even slightly better. Win!

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 Post subject: Re: The Wahscillator
PostPosted: Sun Mar 16, 2014 6:55 pm 
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Here's the sound with LED/LDR:

https://soundcloud.com/effdub/wahscillator-with-ldr-led

Definitely sounds more like a wah and now nothing like a phaser.

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 Post subject: Re: The Wahscillator
PostPosted: Sun Mar 16, 2014 9:04 pm 
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culturejam wrote:
Here's the sound with LED/LDR:

https://soundcloud.com/effdub/wahscillator-with-ldr-led

Definitely sounds more like a wah and now nothing like a phaser.


That is Clutch LFO-Wah in a box! I want all of this awesomeness! :shock:

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After reflowing and several attempts at signal tracing and switch testing I plugged in the power.


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PostPosted: Sun Mar 23, 2014 10:18 pm 
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Trimmer does nothing of value. I will remove it from the next version.

Toggling the value of C6 can make it sound more or less phasery. Lower value = more "watery" and sort of phaser-like.

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