Kay Fuzz schematic fix

[Rodgre]

According to my actual Kay Fuzz, the output/tone control section is different from any of the schematics I've seen online.

As someone already pointed out, there is a .1 cap at one of the legs of the tone pot, but on my pedal, the tone pot is a 250K, and the other leg does not go to a resistor, but straight to ground.

Just thought I'd share what I just learned.



Roger

[vortex]

Thanks for the correction!

How does the Kay sound?

[petemoore]

Looks Cool...how DOeS it sound?

[R.G.]

I don't have a Kay fuzz to compare to, but

are you sure about that??

You say it's a tone pot, but what you have drawn would act like a volume pot at least partially. At full rotation one way, the signal output is connected to ground by that leg of the 250K that's grounded.

Does it really cut the volume to zero when rotated fully one way?

[Rodgre]

The pot is similar in sound to a Super-Fuzz's tone switch. I will check it again, but I was surprised myself to not see that resistor on the pot.

How does it sound? Well, it's not unlike a Super-Fuzz. It's in a very similar vein, but slightly different.

Chewy octave-fuzz!

Roger

[brian wenz]

Hello Hello -
      Any findings ??
Brian.

[Pedal love]

I tend to agree with R. G. It seems as if the signal would short to ground enough to not be audible, if the pot were turned one way. I would say the tone control is possible, if that leg were connected to a capacitor then ground, instead of shunted to ground. I can't really tell.pl

[Rodgre]

What if the pot travel was very short? I've never taken the pot out in order to see if it's full travel actually kills the volume, but that lug not only goes to ground on the board, but goes right to a ground screw attacked to the shaft of the pot.

I'll post some photos.

Roger

[R.G.]

What if the pot travel was very short? I've never taken the pot out in order to see if it's full travel actually kills the volume, but that lug not only goes to ground on the board, but goes right to a ground screw attacked to the shaft of the pot.

So - God didn't give you an ohmmeter to measure resistance between a pot lug and a wiper with the power off???

[Dan N]

I made the changes to my homebrew. For the first 1/3 of the pot travel the pot does sweep the tone. Keep turning and the volume turns off.

From the get-go we have been working from the bad schematic pasted to the effect. So, we needed to add a cap. Now, we need to switch the pot and the pot ground. Is it right now? Maybe. Maybe not.

Roger, with a top and bottom pcb photo we can kick it's little orange butt right here and now.

[brian wenz]

Hello Hello Dan--
       Yeah, I just tried the "new" changes, too.  I got the same results as you.......wonder what would happen if we used the 250K pot with the "old" schematic???
Brian.

[Rodgre]

What if the pot travel was very short? I've never taken the pot out in order to see if it's full travel actually kills the volume, but that lug not only goes to ground on the board, but goes right to a ground screw attacked to the shaft of the pot.

So - God didn't give you an ohmmeter to measure resistance between a pot lug and a wiper with the power off???

Sorry. I had to borrow an ohmeter from baby jesus, and the travel on the 250K pot goes from about 1K to 10K from one extreme of the sweep to the other. What a strange way to design this circuit, eh? I mean what electrical engineer would think to make a tone control this way? Seems like it was a happy accident to me.





Roger

[brian wenz]

Hello Hello--
     I think I like the "old" way better............there's more control over the overall tone.      Hhmmmmmmm..................
What does everybody else think?
Brian.

[Dan N]

Thanks Roger!

I can't see anything to make me doubt your revision. Ha ha, from the makers of the FY-2...

[brian wenz]

Hello Hello--
    Oh well......I guess this thread's dead.
Brian.

[mrsage]

Hello Hello--
    Oh well......I guess this thread's dead.
Brian.

I'll try to bring it back to life...

I have a friend who wants me to make one of these.

Anyone have a working layout? Or should I just try perf-ing it from the schematic?


Do you guys have yours housed in a wah casing or a standard box?

[brian wenz]

Hello Hello--
        I perf mine right off of the schematic....seems to work fine!
  I boxed mine up in some old  '60's - looking triangle-shaped thing.  [Must have been an effect pedal of some sort.......don't know what kind.]
I had to do a little bias adjusting  on the second pair of trannys and added a volume control but outside of that it was pretty cool.  
Brian.

[mrsage]

What trannies and diodes did you end up using?

I can't find the ones it calls for, so I'll probably have to sub something else in there.

[brian wenz]

Hello Hello---
    I used BC 184 for the first pair and BC 182 for the second pair  [going from input to the middle of the circuit....]   The first pair of trannys are supposed to be higher gain then the second, so that's what I came up with.
Brian.

[brian wenz]

Ooops, sorry--
     I don't remember what  #  diodes I used [and I can't see any numbers  on 'em now that they are in  the circuit].
Brian.