Station Wah as Seagull...
- Thread starter Big Monk
- Start date
Chuck D. Bones
Circuit Wizard
It will work, but it will be pretty boring if you can't modulate it by rocking the treadle. There are better places to pick off the "Echoes" tone than the input.
Big Monk
Well-known member
I’m not familiar enough with the effect. I imagine a better idea would be a switch on my Wah then.
Chuck D. Bones
Circuit Wizard
You need the tone knob, pickup selector and the wah treadle to get to all of the tones.
Big Monk
Well-known member
I imagine a big knob like you see on vibe pedals would be suitable for the Wah control. Or I’ll simply add a switch to my wah.
Chuck D. Bones
Circuit Wizard
It's not all in the tone control. The pickup select and wah treadle are also key ingredients in obtaining all of the possible tones.
As for being way loud, there is a better place to pick up the output signal when in Gilmour Mode.
Chuck D. Bones
Circuit Wizard
Or voided it.
Barry
Well-known member
Hell I got two parrots that give me plenty of bird tones, wanted or not!
fig
Village Idiot
I'd really like to know your thoughts.
Chuck D. Bones
Circuit Wizard
A little background first. When David Gilmour recorded that famous "seagulls in outer space" tone, the CryBaby had the classic two transistor design. Same as the Tear Jerker, but without the DIP switch and trimpots. The output is taken off of the collector of the 1st transistor. This point is inside the feedback loop that controls the filter freq and it has a high impedance. The high impedance makes it sensitive to loading and the location inside the feedback loop means it could, under the right conditions, lead to oscillation. Guitar pickups are highly resonant and the tone control affects the resonant frequency in a big way. By happy accident, Gilmour discovered what happens when you connect a guitar to the CryBaby's output jack. The entire circuit breaks into oscillation and that signal is present pretty much everywhere. The input jack is one place to pick up the signal, but you could just as well get it from the output jack or other places in the circuit. When I tried hooking my GCB-95 backwards, I got the seagull tone, which surprised me because that design has a 3rd transistor installed as an input buffer. It's the same circuit as the Station Wah. The Seagull tone passes backwards thru Q1. If you want to be able to control the volume of the Seagull tone, then a good place to pick-off the tone is at or near the collector of Q2. I recommend connecting an A500K pot with pin 3 at the board output, pin 2 goes to the Gilmour switch and pin 1 to ground.
Here are the details of how to do it with the Station Wah. Other CryBaby derivatives such as the Tear Jerker and ShamWah can be implemented in a similar fashion. Only 2 new parts: VR2 and S2.
Here are the details of how to do it with the Station Wah. Other CryBaby derivatives such as the Tear Jerker and ShamWah can be implemented in a similar fashion. Only 2 new parts: VR2 and S2.
Chuck D. Bones
Circuit Wizard
Definitely benefits from a delay.
Big Monk
Well-known member
Whats the purpose of VR2? Simply to knock down the output volume of the oscillation sound?
Chuck D. Bones
Circuit Wizard
Yes. If you follow the wah with a volume pedal or distortion box, you can limit the signal and/or adjust the volume that way. The oscillations are 5x to 10x bigger than a typical guitar signal.
Big Monk
Well-known member
In your opinion, would it work better in a normal wah or in a fixed wah?
