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DIY Stompboxes => Building your own stompbox => Topic started by: nguitar12 on July 12, 2015, 07:46:30 AM

Title: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: nguitar12 on July 12, 2015, 07:46:30 AM
(http://fuzzcentral.ssguitar.com/fuzzface/fuzzfacepnpschematic.gif)

Hey guys I am planing to build a fuzz face according to the above circuit. Can I use 2n5088/ 2n3904 in replace of the requested one?

Thanks in advance.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: Kipper4 on July 12, 2015, 07:55:03 AM
This design uses a PNP transistor so no it won't work with an NPN transistor.
Even if you reverse the cap polarity and power rails it's unlikely to fair well you may be better to choose an NPN fuzz design
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: Kipper4 on July 12, 2015, 07:59:50 AM
http://fuzzcentral.ssguitar.com/schematics/axisfuzzschem.gif

Maybe this which by the way had a recent topic with mods.
Edit;
Right here

http://www.diystompboxes.com/smfforum/index.php?topic=111360.0
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: nguitar12 on July 12, 2015, 08:01:25 AM
This design uses a PNP transistor so no it won't work with an NPN transistor.
Even if you reverse the cap polarity and power rails it's unlikely to fair well you may be better to choose an NPN fuzz design

(http://fuzzcentral.ssguitar.com/fuzzface/fuzzfacenpnschematic.gif)

Just found another NPN version.
I don't see any different in circuit between the NPN and PNP one. Why is that?
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: Kipper4 on July 12, 2015, 08:25:17 AM
Some big differences look at the cap polarity and power rails. The pnp is positive ground, not so the npn.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: GibsonGM on July 12, 2015, 08:30:07 AM
What Kipper said - try the Axis Fuzz...it's a great place to start for an NPN fuzz, and you can mod from there. 
There are many variants of this basic circuit all over the place...
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: nguitar12 on July 12, 2015, 09:04:16 AM
What Kipper said - try the Axis Fuzz...it's a great place to start for an NPN fuzz, and you can mod from there. 
There are many variants of this basic circuit all over the place...

Axis Fuzz seem having many parts count.
I want to make the circuit as simply as possible.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: Cozybuilder on July 12, 2015, 09:22:05 AM
A couple of days ago I breaded one of these, with 2N3904 for Q1, and 2N5088 for Q2. The values you show in the NPN circuit above are generally OK, if you want some more volume, change the 330R to something higher, say 1K, and put a trim pot in the 8K2 spot, adjust for 4.5V on Q2C. You can use a lower value volume pot- an A25K works fine and helps to drive cables. There are many posts on how to modify a fuzz face, get out your breadboard and have fun with it.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: nguitar12 on July 12, 2015, 09:48:53 AM
A couple of days ago I breaded one of these, with 2N3904 for Q1, and 2N5088 for Q2. The values you show in the NPN circuit above are generally OK, if you want some more volume, change the 330R to something higher, say 1K, and put a trim pot in the 8K2 spot, adjust for 4.5V on Q2C. You can use a lower value volume pot- an A25K works fine and helps to drive cables. There are many posts on how to modify a fuzz face, get out your breadboard and have fun with it.

Wow this is definitely a great information. I am going to try it out soon. Thanks for all who helps.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: GibsonGM on July 12, 2015, 11:17:12 AM
What Kipper said - try the Axis Fuzz...it's a great place to start for an NPN fuzz, and you can mod from there. 
There are many variants of this basic circuit all over the place...

Axis Fuzz seem having many parts count.
I want to make the circuit as simply as possible.

Well then, just use that 2nd schematic up there, for negative ground/NPN, and play with different NPN transistors.  Once you get this circuit down, then maybe you'll decide to find others, as there are MANY fuzz circuits out there!   

Each has its own character.   Good luck.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: Gus on July 12, 2015, 11:49:24 AM
link from 2005
http://www.diystompboxes.com/smfforum/index.php?topic=29782.0 (http://www.diystompboxes.com/smfforum/index.php?topic=29782.0)

Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: smallbearelec on July 12, 2015, 12:09:18 PM
Hi--

There is info here:
http://diy.smallbearelec.com/HowTos/BreadboardSiFF/BreadboardSiFF.htm

on how to breadboard and tweak a silicon FF.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: PRR on July 12, 2015, 02:13:30 PM
> I don't see any different in circuit between the NPN and PNP one. Why is that?

(http://i.imgur.com/hQEhDbO.gif)

The interconnection is the same. All the *polarities* are different.

And the 470/330 change, which affects output level. This may be because Si often comes with higher gain than Ge, or may be a random tweak for a specific player/amp combination. You can diddle that resistor 220 to 820 and change the output level without upsetting anything else.
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: nguitar12 on July 12, 2015, 10:20:29 PM
Thanks all. You guys are always being so helpful.  :icon_biggrin:
Title: Re: Fuzz Face using 2n5088/ 2n3904. Will it works?
Post by: mac on July 14, 2015, 12:48:56 PM
You need to lower the 8k2 resistor to 5k6 or so if you want 4v5 at q2 collector.

mac