Adding more fat to a fat boost switch

[Tony Flow MMMM]

Pedal been here. Looking to add a little more fat to my fat boost switch on my wooly mammoth clone. I'm not sure what to replace with a higher or lower value.

[Crater]

Why don't you ask the dude you bought it from? The real Wooly Mammoth doesn't have a fat switch.

If I had to guess, I'd bet the 'fat switch' adds a bigger input capacitor, the stock value appears to be 0.22 µf. A 'fatter' signal needs a bigger cap: common values are 0.47µF, 1µF, 2.2µF, ect...

The other coupling caps in the circuit, the bias bypass cap and the bass output cap are both 100 µF, that's already a HUGE cap for a pedal, so I doubt there's much to be gained by making those bigger.

If you can post a clear, in-focus picture of the pedal's "guts" it might help. Use your digital camera's macro mode if it has one.

[SGD Lutherie]

Originally Posted by Tony Flow MMMM

Pedal been here. Looking to add a little more fat to my fat boost switch on my wooly mammoth clone. I'm not sure what to replace with a higher or lower value.

What are you doing, changing the value of the input coupling cap?

Larger values pass more low end.

[Tony Flow MMMM]

I am contacting the builder. While I have limited understanding I know it can't be that complicated! Thanks for explaining it to me.

[Tony Flow MMMM]

the one on the right is the fat boost.

[SGD Lutherie]

OK, so it's switching between two caps. Fine the one that is the fat position (the opposite of the way the switch is thrown) and try a larger value.

[Tony Flow MMMM]

Seems one is .1 uf and the other is .22

[Tony Flow MMMM]

Originally Posted by SGD Lutherie

OK, so it's switching between two caps. Fine the one that is the fat position (the opposite of the way the switch is thrown) and try a larger value.

So my multimeter battery is dead. How every by your description it seems it switches to the lower cap on fat boost .1uf. Labeled 1j63 it is the larger white one..

[SGD Lutherie]

.22µF is larger than .1µF. Try a .33µF.

[Tony Flow MMMM]

Originally Posted by SGD Lutherie

.22µF is larger than .1µF. Try a .33µF.

That's what I'm saying. Does something seem off? The fat boost cap is .1? I'm gonna pickup some .33 ect

[Tony Flow MMMM]

Well this was builders reply.

Now keep in mind that its just a fat switch not a boost circuit. All it does is keep you bit more low end in passive mode. The value that is there is 1uf capacitor. You can try going larger and see how it works. But it was only meant for passive bass, I think once in active bass mode might not be as noticeable
Thanks

[Tony Flow MMMM]

Soo... Any help? Will an increases cap raise the boost?

[Mykk]

Originally Posted by Tony Flow MMMM

"Now keep in mind that its just a fat switch not a boost circuit."

Originally Posted by Tony Flow MMMM

Will an increases cap raise the boost?

Doesn't sound like it'll boost anything, however a higher value cap will allow more lows to pass through the signal.

[Tony Flow MMMM]

Sorry that's what I mean... Guess I need to watch my wording. And experiment a little.

[SGD Lutherie]

Originally Posted by Tony Flow MMMM

That's what I'm saying. Does something seem off? The fat boost cap is .1? I'm gonna pickup some .33 ect

No, I think the boost cap is .22 since that is larger, so it lets more low frequencies through. Don't forget that most switches switch backwards. When you switch the switch up, the contacts switch down.

You are going to get to a point where you wont get any more low end. One of the things about fuzz is it adds high frequency harmonics, and that makes the bass sound brighter and reduces the apparent low end.

[Tony Flow MMMM]

He said it him self it's 1uf. However when I looked it up it was .1uf..

So now I'm not sure which to believe.