BAJA Brighton Fuzz - (an updated silicon fuzz face variant)

JOHNO · Post by **JOHNO** » 06 Jun 2010, 06:26

Just in the middle of building one of these and noticed some small errors in the part's layout. The 2.2uf cap under the IC should be 4.7uf and the 22uf next to it should be 2.2uf according to the schematic.

JOHNO · Post by **JOHNO** » 06 Jun 2010, 07:30

Ok It's all finished now. I have a problem with the gain pot, from 0 to 9 it's just clean tone. All the distortion is bunched up in between 9 and 10. I'll just keep going over it untill i find the trouble. As alway's i was very careful selecting the part's. Measured every resistor before installing them. Being color blind is a pain in the arse sometime's.

JOHNO · Post by **JOHNO** » 06 Jun 2010, 08:02

Changed the gain pot to 1k and now it work's as it should.

Ben N · Post by **Ben N** » 06 Jun 2010, 08:48

That looks great! The irony is, if I do end up building it any time soon, I'll probably end up using a Russian Ge Q2, just because that may be all I have handy in the right hfe range. Would a 2N2369 work there? Also, the mind gets working---it might be fun to rig up something hotcake-ish on that output buffer opamp.

bajaman · Post by **bajaman** » 06 Jun 2010, 09:54

Just in the middle of building one of these and noticed some small errors in the part's layout. The 2.2uf cap under the IC should be 4.7uf and the 22uf next to it should be 2.2uf according to the schematic.

Ooops

here is the corrected layout picture - sorry
bajaman

JOHNO · Post by **JOHNO** » 06 Jun 2010, 10:24

bajaman wrote:Ooops
here is the corrected layout picture - sorry
bajaman

No need to say sorry, it's just a small slip up. Really great little fuzz box this, it kind of sounds like it let's through some of the natural sting sound even with the gain cranked way up. Kind of transparent in the upper registers of the fret board. Haven't had a chance to crank the "Champ" up yet to see what this fuzz sound's like through all that tubey goodness. I had trouble with the output jack, the one's I have just don't fit properly. I'll have to track down some that will. Anyway thank's again baja
Regard's Johno

gus · Post by **gus** » 06 Jun 2010, 20:17

Have you looked at this?
https://www.diystompboxes.com/pedals/3tran.JPG
thats been up for years
One could bootstrap the input EF I left some pickup loading in on purpose. One could also add a EF output. Note the thin thick switch

Big cheese has opamp buffers and a nice tunable BMP tone control. Do want that much gain 100K, 4.7K 1st FF stage gain setting resistor. I am not a fan of 100K feedback more often 47K work out the math The interaction with the guitar having less closed loop gain at the first FF stage allows finer control of what people call "touch".

D+ opamp buffers posted some time ago
http://www.aronnelson.com/gallery/main. ... ewsIndex=1
Hand drawn and you might need to save it and view it with other software. Note the added HP control

Ben N · Post by **Ben N** » 07 Jun 2010, 06:50

Gus, the D+ link isn't working for me.

roseblood11 · Post by **roseblood11** » 07 Jun 2010, 08:03

It works!The picture is so large that you only see a white part as long as you don´t scroll down

Ben N · Post by **Ben N** » 07 Jun 2010, 13:41

Aha, I see. Definitely NSFW, then.

bajaman · Post by **bajaman** » 07 Jun 2010, 22:04

NFSW

Ben N · Post by **Ben N** » 07 Jun 2010, 22:07

I deal in words. Scrolling around a giant hand-drawn schematic during work would not make the right impression.

bajaman · Post by **bajaman** » 07 Jun 2010, 22:27

I deal in words as well - not abbreviations

What does NFSW mean ?
Not Fucking Scroll Worthy?????
cheers
bajaman

jbgron · Post by **jbgron** » 07 Jun 2010, 22:36

Not Safe For Work

bajaman · Post by **bajaman** » 08 Jun 2010, 00:40

thanks

SpencerPedals · Post by **SpencerPedals** » 08 Jun 2010, 01:27

I like Baja's way better. The context and irony still have me giggling.

bajaman · Post by **bajaman** » 08 Jun 2010, 03:27

Ben N · Post by **Ben N** » 08 Jun 2010, 06:12

Definitely fucking scroll worthy!

JOHNO · Post by **JOHNO** » 08 Jun 2010, 07:56

Looking at the schematic, pin 8 gets power directly from the power source but on the pcb layout pin 8 is connected to the other side of the 100R resistor.

roseblood11 · Post by **roseblood11** » 08 Jun 2010, 09:12

The schematic is wrong. Pin 8 has to be connected after the 100R (where the 100R and the 220µF meet...).
The 100R and the 220µF electrolytic are for power supply filtering.