Adding a Rotary Cap switch to an FF circuit ??

[BD13UK]

I wondered what cap values you Guys would suggest for a 4 way rotary addition to a FF type circuit, I imagine that this is probably what the Afro Fuzz and the new Seymour Duncan Tweak Fuzz is most probably about and thought of starting at say 0.0047uf and ending up around 1uf with another couple of options in the middle, I dont want too much bass with that flabby bottom end that some FF's have so any thoughts/comments on this would be most appreciated, I'd like to attempt this on a hybrid Ge/Si and then an all Si type.
Thanks

[E-money]

I'm finishing a fuzz based on the Multi-Face at runoofgroove.com.

I took 4qty 6 position rotary switches and wired them up so that I can switch between 6 different input caps, 6 different output caps, 6 different first stage transisitors and 6 different second stage transistors.  It gives me a pretty wide range of tones.  I think the numbers you listed look good, but I would try bread boarding it first to find a good 4some that gives you nices stages between a thin tone and a fat tone.

[Dragonfly]

..id also suggest using the rotary switch to change the output cap, instead of the input...in my experience, you get more of a "change" by tuning the output cap on a FF....

YMMV...

Andy
Dragonfly FX

[Triffid]

id also suggest using the rotary switch to change the output cap, instead of the input...in my experience, you get more of a "change" by tuning the output cap on a FF

Wow, i thought the opposite.  I really enjoy the pot/cap blend for the input that the easy face does.  I added that to my germ ff and really enjoy getting rid of the "woofiness" sometimes.   It also seems to help give me a smoother transition from no-wah to wah with out completly changing my tone.

just my 2c

[Mark Hammer]

When it comes to distortions, BOTH preclip and postclip tonal adjustments are useful and desirable.  Think of it like the ingredients that go into the cake batter vs the parts of the baked (and iced) cake that you decide to eat - you can pick your favourite parts, but you can also bake a different cake to select from.

Although not a "deal-breaker", one of the problems with some implementations of rotary switches is that they introduce pops when capacitors are disconnected then connected.  There are many contexts where this is moot, and plenty of ways to make pops go unheard (e.g., turn the output level down when switching), but there are also contexts where this in undesirable (e.g., on the fly adjustments mid-gig).  

As such, it is often preferable to implement rotary switches to shunt combinations of caps in series to attain different effective values, rather than select *between* different caps.  Failing that, Joe Gagan's brilliant solution of using a small cap and parallel cap with series variable resistor provides plenty of useful variation in a pop-free manner.

[WGTP]

I was thinking the the Duncan Pedal might change the by-pass cap, which is usually 22uf.  I'd probably go 47, 22, 10, & 4.7uf.  The smaller ones will reduce the woofiness and gain.  Changing the input and output at the same time is a cool idea.  One larger as the other gets smaller.  

You can also use the cap blend at this location, as well.   :twisted: