Fairfield Circuitry - The Barbershop (gut)  [traced]

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Re: Fairfield Circuitry - The Barbershop (gut)

Postby cortezthekiller » 18 May 2009, 18:15

lugs 2 and 3 should be disconnected from the top of the 9.1k resistor and lug 1 should connect to it.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby WhiteKeyHole » 18 May 2009, 20:23

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I figured D1 might be a zener. Also, thanks for the correction on the sag control, Fairfield.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby briggs » 18 May 2009, 21:24

I'm liking the look of this little circuit. I loved the demos that are about on youtube, I might have to give it a go :)
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby analogguru » 19 May 2009, 01:24

....and if you are not a crackle-fetishist you can modify the circuit as shown below. You can also add a 100n cap followed by a 1M pulldown between the drive poti and the second FET, but this is a minor change.

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Re: Fairfield Circuitry - The Barbershop (gut)

Postby briggs » 19 May 2009, 01:31

Take the DC off of that pot. I would be tempted to set the circuit up with the 100n 1M as AG says just to remove all traces of DC on the pots.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby IggY » 19 May 2009, 07:20

Mr. Fairfield: is C7 in reality placed as drawn in the latest circuit diagrams,
or is it placed on the other side of POT2?
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby fairfield » 19 May 2009, 14:21

Iggy, indeed C7 is placed between R10 and POT2.

Crackle fetish? Sweet stuff, my new fetish is much less expensive than my last. Alls I needs is a battery, a pot and a few alligator clips....mmmmm. It actually makes more of a swooshing sound, like rubbing your socks against a carpet.

It was a conscious choice, I like the fact that the output impedance can be 10x lower.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby IggY » 19 May 2009, 16:18

fairfield wrote:Iggy, indeed C7 is placed between R10 and POT2.


Thank you Guillaume,
from watching and hearing the video on your site it seemed more plausible.
Both for the soundcharacter change after the pot is being turned to right,
as well as for the fact that this change sets on immediately.
With the timeconstant of the 220uF and the sagpot,
that change would take ages otherwise (assuming a modest currentconsumption by the transistors).
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby briggs » 19 May 2009, 18:12

I'm going to build one up. I'm loving the demos and I'm into low gain overdrive!

Did you ever contemplate using SK170/117 fets in the design of the barber shop Mr F?
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Re: Fairfield Circuitry - The Barbershop (gut)  [traced]

Postby WhiteKeyHole » 19 May 2009, 20:42

Toaster strudels.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby TJSmitty » 20 May 2009, 04:19

Sexy circuit.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby dap9 » 15 Jun 2009, 03:36

Has anyone put this on a bread board or anything yet? A few guys over at HC got the pedal and absolutely raved about it. The demos seem OK to me, but now that I've heard the reviews, I think this may be right up my alley... I'm all about the subtlez!
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby Cow4prez » 16 Jun 2009, 04:54

fairfield wrote:The 100k log is Drive and the 10k log is Volume. Indeed about the 10k linear, but Sag is also adjusting the bias of other transistors. Who said there was nothing between the first and last stage?
The plot thickens.

Don't get too excited about this circuit. Like so many others, the schematic doesn't explain why it sounds good. I was wondering...

Who here would enjoy receiving a newly purchased pedal with printed schematics in the box?


sure and what a "novel" idea, and it's good for repairs, modification, re-interpretation, analysis, discussion and maybe even cloning. But don't goop the schematic because that would defeat the purpose ;)
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby theblackman » 16 Jun 2009, 06:15

wow this is a really nice sounding pedal from the youtube vids.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby Beedoola » 20 Jul 2009, 19:12

Anyone build one yet?
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby dap9 » 26 Jul 2009, 04:20

Not sure if y'all have seen this, but a guy at HC posted this clip of a bunch of dirts (OCD, DLS, Tim, Screwdriver, etc) and the Barbershop. It's pretty cool how the Barbershop adds some sparkle to each of them. It's been a while since I've read this thread, so hopefully the scheme's accurate, b/c my curiosity has not officially be piqued!

http://www.youtube.com/watch?v=forpvJDj0-0
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby daz » 30 Jul 2009, 04:27

i've sketched up a rough stripboard layout. I'll see if I can put it up tonite.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby uncleboko » 30 Jul 2009, 09:34

I read "Barberpole" at first - wishful thinking!!
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby daz » 30 Jul 2009, 14:38

Here's my shot at it. Have some grace, first time doing it on a stripboard and done in a hurry.
Let me know any errors.
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Re: Fairfield Circuitry - The Barbershop (gut)

Postby fairfield » 30 Jul 2009, 19:36

Fairgo Shaver...
I don't know if I'm out of line here, but how about keeping the name intact?
Why pretend that this is something it's not...

If any of you read japanese, this guy has built one with a few little mods.
http://blogs.yahoo.co.jp/mitani518/folder/1181715.html
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