Fairfield Circuitry - The Barbershop (gut)

noelgrassy · Post by **noelgrassy** » 30 Jul 2009, 19:23

Not out of line at all!
You've been kind enough to share your circuit.
Let's show the respect due the originator.

Some folks kids....

daz · Post by **daz** » 31 Jul 2009, 00:02

Hi Guillaume,
Sorry no disrepect was intended. Really appreciate sharing your circuit. I've updated accordingly.
Many thanks

Greg · Post by **Greg** » 31 Jul 2009, 00:34

Just to keep things in perspective...
we've also had builders get offended, and ask that clones of their pedals NOT be called the original name because they weren't built by them and were just someone else's interpretation.

noelgrassy · Post by **noelgrassy** » 31 Jul 2009, 03:42

^^^ Point taken.

Greg · Post by **Greg** » 31 Jul 2009, 04:01

That wasn't really directed at you BTW..
Just an observation for all..

fairfield · Post by **fairfield** » 31 Jul 2009, 14:09

No disrespect taken. Take it as a token of appreciation for the free exchange of information.

I can understand that some builders take offense at what's going on here but I think it's pretty clear that with or without our consent, there are resources like this one that will post schematics of commercial products. Why pretend that it's not going on?

daz · Post by **daz** » 25 Aug 2009, 01:20

I actually ended up buying a barbershop and really like it. Great build quality and design, and it sounds great. Nice one Guillaume!

noise31 · Post by **noise31** » 18 Jan 2010, 13:31

this pedal sound really great,,,,,
it´s posyble,,,,post a PCB version,........

fairfield · Post by **fairfield** » 20 Jan 2010, 23:34

The bias might indeed be off. When sorting the J201s I use in the Barbershop, some have an Idss as low as 200uA while others crack the 1mA. The drain resistors are selected according to measured values. For the record, I bias around 2/3 supply.

What are the specs on your JFETs?

culturejam · Post by **culturejam** » 21 Jan 2010, 03:32

Clearly Guillaume is one of the good ones.

Thanks for sharing your insights and information. We really appreciate it.

fairfield · Post by **fairfield** » 21 Jan 2010, 04:08

Sound clips? That's pretty sweet, I'm curious to hear...

fairfield · Post by **fairfield** » 26 Jan 2010, 20:29

Sweet stuff, sounds pretty good to me. Definitely has the same character. Gotta love that brown sound, and those odd intermodulation products that stick out here and there.

Jack Deville · Post by **Jack Deville** » 26 Jan 2010, 20:32

fairfield, you're a cool dude.

Okonomiyake · Post by **Okonomiyake** » 10 Feb 2010, 07:19

Hi All, since it's supposed to snow several feet here tomorrow and probably end all life as we know it, I figured I'd ride out the frozen armageddon by perhaps building a pedal, maybe this one. My only issue is I don't have anything resembling the polarity protection jfet (VP3203). Can someone recommend an alternative that might be more commonly accessible? Or, if I promise not to plug the wrong polarity power supply in, could it be omitted altogether? Thanks much.

fairfield · Post by **fairfield** » 10 Feb 2010, 13:58

I say leave it out, it's really only a safety. As an alternative, you could put a diode in series if you don't mind the voltage drop.

lama00 · Post by **lama00** » 17 May 2010, 13:46

Hi,

I'm very interested in building this pedal.

I just have a question: as Okonomyake said I also can't find a vp3203 and Guillaume Fairfield said

fairfield wrote:I say leave it out, it's really only a safety. As an alternative, you could put a diode in series if you don't mind the voltage drop.

You mean: leave D1 at the place on the vero (C16-D16) but the other(s) mentionned "in series"? where to place it (them) ?

Could you specify ?

Tx

lama00 · Post by **lama00** » 02 Jun 2010, 19:45

Any ideas ?

fairfield · Post by **fairfield** » 05 Jun 2010, 02:16

No, the series diode would replace R11, Q4 and D1. Anode at E17, cathode at C17.

Good luck with your build.

lama00 · Post by **lama00** » 05 Jun 2010, 04:34

Thank you ro reply.

An for the value I was told that I need a shotky diode mA - 50 volts. Do you think it's enough ?

fairfield · Post by **fairfield** » 10 Jun 2010, 21:32

Yes it's plenty. Schottky because of the low forward voltage drop but you could even use almost any small signal type such as 1N4148 or 1N914.

Fairfield Circuitry - The Barbershop (gut) [traced]