Build report: uStomp FA-1 clone

[TheBigMan]

Finally debugged it.  I had a tiny solder bridge that I enventually found after much use of an audio probe (How did I ever work without one?).  I'm currently using a TL072 for the opamp and a 2N5457 for the FET, although I do have a couple of 2SK246s very kindly donated by our own trescat which I'll use when I'm certain the pedal is working 100%

It doesn't seem to have much gain above unity, and the bass pot cuts the sound at it's extreme low, so there are still a couple of bugs in it yet.  Sound is quite nice and sparkly, but considering what the real thing fetches I personally would choose my old DOD FX10 which I stupidly sold.

[jimbob]

what layout did you use for this?

[Joep]

The FA-1 layout (and more!) can be found here

It doesn't seem to have much gain above unity

This is not good, the FA-1 should have plenty gain.

Bye,

Joep

[mrsage]

There's also a schematic, layout, and PCB here:

http://prophecysound.com/diyroot/effectsDIY.html

[Ben N]

Anyone know how similar the FX10 is to the FA-1?  A side from the obvioius--the Baxendahl--is it pretty much the same?

Ben

[TheBigMan]

This is not good, the FA-1 should have plenty gain.

Bye,

Joep

Yeah, that's what I figured.  I'll trace through it some more with the audio probe and see what I can find.

[RDV]

FET pinouts?

RDV

[ustompsteve]

Joep is right. This pedal has insane amounts of clean boost.

If you aren't getting that, there is a problem.

In fact, to my ears, it is a very un-colored boost.

--Steve