Boss FA-1
A clean boost pedal that is used by U2 guitarist “The Edge”.
This is a work-alike circuit as the original op-amps and FET are hard to come by.
I used a 4558 for the IC and a J201 for the FET.
Note that the 47uF cap is non-polar.
Download Build Diagram and Etch Template
Download Schematic
August 30th, 2008 at 6:22 am
Nice PCB layout!
I’ve seen that small bear carries the HA1457W and 2SK246-GR. Do you think it would be worth to get them? I’m in Germany so shipping would be at a bit of a cost.
I also saw that you are using only one 4558 (dual opamp) where the original uses 2 HA1457Ws. Are C13 and C14 (both 100p caps) not required for the 4558?
Oh yeah, would you share your ‘eagle’ schematic with me?
Thanks,
Gerrit
January 12th, 2009 at 1:57 pm
Hi,
you´ve got some really good Layouts here!
But is it true that there´s a 47µF non polar Cap in the circuit?
The original schematics says “0.47µF.
I can´t find a non-polar 47µF that would fit in there – they´re all too big and have axial leads.
Immo
April 20th, 2009 at 7:29 pm
… and if I understand that circuit, the 47µF non-polar cap wouldn´t make any sense! I think a 0.47µF film cap should do the job.
Would be nice to read what you think about that!
Or has anybody else built the FA-1?
April 14th, 2010 at 10:26 am
Yeah, it needs to be a 0.47uF Non-Polar electolytic.
I traced the original PCB part for part, after owning an original FA-1.
I made a clone, after managing to find the last 2 HA1457W’s locally (paid almost 9 euro a piece for them!) and that little shop (now out of business) also had 3 correct 2SK246-GR FET’s around.