Inductor/coil for Schaller Wah-Wah-Fuzz?

[Cardboard Tube Samurai]

Anyone know where to source one? If not, anyone got a link to a schematic or something where I can find out what its specs are?

[aron]

It's probably your standard 500mH inductor. You can get the Dunlop inductors from the Store link above.

[Cardboard Tube Samurai]

Cheers! I broadened my search and that seems to be the best I can come up with, I just thought I'd check with people "in the know"

[Paul Marossy]

I would also guess that it uses a 500mH inductor. The Schaller Bow Wow Yoy Yoy uses one, so I imagine that their fuzz wah would use the same...

[alfafalfa]

It defenitely is  500 mH , I used to have one and checked.

Alf

[Cardboard Tube Samurai]

Thanks! Lucky too I guess since I already ordered a red fasel to replace it. I reckon I'm going to be revisiting this thread to find out how to wire it up correctly though. The guy's battery came loose and knocked the inductor clean off with no clues as to where it was connected

[Paul Marossy]

Thanks! Lucky too I guess since I already ordered a red fasel to replace it. I reckon I'm going to be revisiting this thread to find out how to wire it up correctly though. The guy's battery came loose and knocked the inductor clean off with no clues as to where it was connected

Hmm... maybe while you have it in your possession you could draw up a schematic for it? I'm guessing it's not too different from your standard wah circuit, but I could be wrong.

The only Schaller wah schematic I could ever find is this one: http://www.diyguitarist.com/Schematics/BowWowYoyYoy.gif
Maybe yours has similarities? I would be interested to see if the wah is basically like the Bow Wow-Yoy Yoy without the second inductor.

[Mark Hammer]

Not to derail the intent of the thread, but does ANYONE have any notion whatsoever what the addition of that extra inductor and cap in the Yoy-Yoy setting does in electronic terms?  I know precisely what it does tonally, and it is one of my favourite stompbox tones for the past 35 years.  But in the absence of any idea about what it is doing electronically, I a) have no idea if the schematic is correct, and b) have no idea if it is possible to emulate via other analog means.

[Paul Marossy]

Not to derail the intent of the thread, but does ANYONE have any notion whatsoever what the addition of that extra inductor and cap in the Yoy-Yoy setting does in electronic terms?  I know precisely what it does tonally, and it is one of my favourite stompbox tones for the past 35 years.  But in the absence of any idea about what it is doing electronically, I a) have no idea if the schematic is correct, and b) have no idea if it is possible to emulate via other analog means.

I'm taking a guess here, but it looks to me like it is shifting the frequency range/sweep curve by switching either between a 1M resistor to ground, or directly to ground at that second inductor.

[Mark Hammer]

Nah, if you played with one you'd know that isn't what it does.  Here's how to envision it.  Make a wah-wah sound with your mouth.  Note how your tongue is pulled back from the front of your mouth (usually tucked behind your lower teeth) and when you say "wah" your mouth opens up wider.  With "Yoy-yoy" you would suck in your cheeks, pucker up your lips, and wedge the tip of your tongue into your puckered-up lower lip.  NOW try and say "wah" while maintaining that mouth configuration.  Comes out more like "weh" or......."Yoy-yoy".  Not exactly the same, but still pretty close, is the synth phrase from the Cars' tune "Let's Go" ( http://www.youtube.com/watch?v=rpA3NVafsdo ).  Nope.  Much more than a simple change in range or sweep; it's a different kind of filter.

[Paul Marossy]

Nope.  Much more than a simple change in range or sweep; it's a different kind of filter.

Yeah, I guess that's true. But OTOH, all that switch does is switch 1M resistor to ground in or out of series with that second inductor. Does that constitute an entirely new filter? I see it more like additional filtering, which would alter certain frequencies more.

[snap]

the upper coil goes from collector to base
the lower goes from base to ground

[Paul Marossy]

the upper coil goes from collector to base
the lower goes from base to ground

That's a good point. That probably has much to do with how it's doing the filtering between Bow Wow and Yoy Yoy modes...

[Gus]

What I think the design was
The 1 meg makes sure the coil is always connected to help reduce transits when switched in or out.  The 1 meg effectively disconnects the  series cap and inductor when the switch is open but still leaves a high resistance path to ground.

Been looking around the web, n 48 and maybe 3e8 might be the core material anyone know for sure?

[Cardboard Tube Samurai]

Okay, so on the old inductor there were 4 points soldered to the board but the red fasel only comes with 2 solder tabs. I'm going to go with the "trial and error" approach but do I run the risk of seriously damaging any other components if I do this?

[Cardboard Tube Samurai]

Nevermind, I seem to have oriented it correctly on my first attempt. Sounds awesome!!!

[Paul Marossy]

Nevermind, I seem to have oriented it correctly on my first attempt. Sounds awesome!!!

Cool!  Would you be interested in drawing up a schematic for us while you have that in your possession?

[Cardboard Tube Samurai]

Nevermind, I seem to have oriented it correctly on my first attempt. Sounds awesome!!!

Cool!  Would you be interested in drawing up a schematic for us while you have that in your possession?

Not only do I not have time (I have to take it back to the owner today) but I've never traced a schematic from a circuit so I would seriously doubt its accuracy, sorry. It's a shame because there are NO schematics available on the net for this effect

[Paul Marossy]

Nevermind, I seem to have oriented it correctly on my first attempt. Sounds awesome!!!

Cool!  Would you be interested in drawing up a schematic for us while you have that in your possession?

Not only do I not have time (I have to take it back to the owner today) but I've never traced a schematic from a circuit so I would seriously doubt its accuracy, sorry. It's a shame because there are NO schematics available on the net for this effect

Yeah, that's why I was hoping you could do that. Can you take some good pictures of the PCB and get the part values? Someone here could figure it out from that...

[Cardboard Tube Samurai]

Nevermind, I seem to have oriented it correctly on my first attempt. Sounds awesome!!!

Cool!  Would you be interested in drawing up a schematic for us while you have that in your possession?

Not only do I not have time (I have to take it back to the owner today) but I've never traced a schematic from a circuit so I would seriously doubt its accuracy, sorry. It's a shame because there are NO schematics available on the net for this effect

Yeah, that's why I was hoping you could do that. Can you take some good pictures of the PCB and get the part values? Someone here could figure it out from that...

It's also been modded a bit. I'm also about to walk out the door to go to work and I'm dropping it off to him on my way home from work.