EQD Bellows

[Plexi]

Built it time ago, really nice fuzz.
Not too much compressed/fizzy, very close to a tradicional distortion: a huge amount of low end.

I tried 2N5457 and J201: both with good (almost the same) result.

I recomend to push it with a SHO kind booster: it turns rich in harmonics and compression, without fall in annoying noise.

Someone says its very close to "Bazz Fuss" design.

I tried a simple treeble roll off: but it have a really nice amount of bass itself. Will be a redundant muddy potentiometer.
I'll try a Big Muff there..

Which mods do you recomends??
Or where do you recomend to change some values??

[Hatredman]

A good candidate to a tiny enclosure, or to put it inside the guitar.

Scarlett Johansson uses a Burst Box with her Telecaster.

[Plexi]

Scarlett Johansson uses a Burst Box with her Telecaster.

Oh..c'mon!! Why is she so perfect!?

[thehallofshields]

So what is going on with this design?

Topology wise it's a Bazz Fuss, but the choice to use a JFET across the Darlington is very peculiar.
If it were a BJT, I'd understand, but the JFET Gate has practically infinite Input Impedance, so how is any current passing through to the Q2 Base???
It could be that the MPSA13 is so high-gain, the guitar signal can turn it on, but then why use the JFET at all?

I'm left thinking the JFET:
a.) Does Nothing
b.) Adds some nominal series resistance that slightly varies with how much current Q2 is pulling. (ie. does nothing)

Thoughts?

[PRR]

> So what is going on with this design?

The FET is not biased in the active zone.

Consider this equivalent:

[bool]

Exactly. And the jfet "body diode" is a bit softer compared to a regular Si signal diode.