Foxrox Hot Silicon Fuzz

warioblast · Post by **warioblast** » 27 Mar 2009, 15:07

Is there any schematic floating around ?

devastator · Post by **devastator** » 27 Mar 2009, 15:20

pf_fan · Post by **pf_fan** » 27 Mar 2009, 15:59

Looks like the same PCB was used for fuzz cards in CC2. This one is Si/Ge hybrid:

https://img514.imageshack.us/img514/5918/2fce3.jpg

warioblast · Post by **warioblast** » 27 Mar 2009, 16:32

What's the value of the ceramic cap ? 472 for 0.0047 uF ?

pf_fan · Post by **pf_fan** » 27 Mar 2009, 17:16

Yes, it's 472. At least in this picture:
https://img293.imageshack.us/img293/5755/86523.jpg

warioblast · Post by **warioblast** » 27 Mar 2009, 20:53

It should be / it is pretty close to this

pf_fan · Post by **pf_fan** » 28 Mar 2009, 09:26

Pics from TGP:

https://i2.photobucket.com/albums/y32/l ... hybrid.jpg
https://i2.photobucket.com/albums/y32/l ... ilicon.jpg
https://i2.photobucket.com/albums/y32/lvxnova/s2-1.jpg

Mich P · Post by **Mich P** » 28 Mar 2009, 18:11

So any schem of that silcon version ?
Thanks.
Mich P.

ianZeds · Post by **ianZeds** » 30 Mar 2009, 10:59

From Dave's site

For years people have been asking me about this..and I'm finally doing it! The Foxrox "Hot Silicon Fuzz" is the same Hot Silicon previously available as a FuzzCard for Captain Coconut 2 only. It's my take on the original high gain silicon FuzzFace with some tweaks and improvements. Foxrox Hot Silicon Fuzz uses a pair of high-gain BC109C silicon transistors, just like many of the original silicon FuzzFaces, and all of the Crest Audio reissues from the late 80's.

puppiesonacid · Post by **puppiesonacid** » 30 Mar 2009, 13:34

am I a retard for thinking you can just swap out the germaniums for silicon as long as the pinouts are the same?

warioblast · Post by **warioblast** » 30 Mar 2009, 15:40

puppiesonacid wrote:am I a retard for thinking you can just swap out the germaniums for silicon as long as the pinouts are the same?

But you also need to reverse the electrolytic capacitors.

What puzzles me the most is the location of the ceramic cap. I put a NPN "Mervin" on the breadboard; with the typical 33k resistor from Q1's collector to +9V.
I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.

Gila_Crisis · Post by **Gila_Crisis** » 30 Mar 2009, 21:54

i don't know why, but i'm supposing that the 4.7nF cap is going somewhere near the input side.....
maybe something like this:

????
of only there were a better pic of the pcb...

JimiB · Post by **JimiB** » 31 Mar 2009, 04:51

I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.

That dosent make any sense. If the cap was across the 100K, it was from Q1's base to Q2's emitter. I do think that would dump alot of high end.

wilkins · Post by **wilkins** » 31 Mar 2009, 05:19

warioblast wrote:
puppiesonacid wrote:am I a retard for thinking you can just swap out the germaniums for silicon as long as the pinouts are the same?
But you also need to reverse the electrolytic capacitors.

What puzzles me the most is the location of the ceramic cap. I put a NPN "Mervin" on the breadboard; with the typical 33k resistor from Q1's collector to +9V.
I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.

this seem on [url=http://analogguru.an.ohost.de/001/schem ... p_JH-2.gif]JH-2[url] C2, put the 4700pF after the input capacitor before the Q1 / R6 & C4.

warioblast · Post by **warioblast** » 31 Mar 2009, 10:53

JimiB wrote:
I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.
That dosent make any sense. If the cap was across the 100K, it was from Q1's base to Q2's emitter. I do think that would dump alot of high end.

You got me wrong.
I meant I tried to put the 472 cap in different places:
_ between Q1's B & C,
_ between Q2's B & C,
_ across the 100k...
but the high end roll-off was too big.

warioblast · Post by **warioblast** » 31 Mar 2009, 10:55

wilkins wrote:
warioblast wrote:
puppiesonacid wrote:am I a retard for thinking you can just swap out the germaniums for silicon as long as the pinouts are the same?
But you also need to reverse the electrolytic capacitors.

What puzzles me the most is the location of the ceramic cap. I put a NPN "Mervin" on the breadboard; with the typical 33k resistor from Q1's collector to +9V.
I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.

this seem on [url=http://analogguru.an.ohost.de/001/schem ... p_JH-2.gif]JH-2[url] C2, put the 4700pF after the input capacitor before the Q1 / R6 & C4.

I've tried that too but it made the circuit noisier.

pf_fan · Post by **pf_fan** » 31 Mar 2009, 13:27

Maybe those pics will be helpful... somehow

http://www.megaupload.com/?d=ELNBOD8D

Barcode · Post by **Barcode** » 31 Mar 2009, 14:30

warioblast wrote:
puppiesonacid wrote:am I a retard for thinking you can just swap out the germaniums for silicon as long as the pinouts are the same?
But you also need to reverse the electrolytic capacitors.

What puzzles me the most is the location of the ceramic cap. I put a NPN "Mervin" on the breadboard; with the typical 33k resistor from Q1's collector to +9V.
I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.

you only need to switch the cap polarity if you are switching to/from positive ground, and you only have to do that if you are subbing in NPN for PNP transistors. If you are using the same type (NPN, PNP) as the exisiting transistors, no change is needed in polarity of anything.

wilkins · Post by **wilkins** » 01 Apr 2009, 02:31

warioblast wrote:
JimiB wrote:
I tried to put the 472 cap between Q1's B & C, Q2's B & C, across the 100k... but the high end roll-off was too big.
That dosent make any sense. If the cap was across the 100K, it was from Q1's base to Q2's emitter. I do think that would dump alot of high end.
You got me wrong.
I meant I tried to put the 472 cap in different places:
_ between Q1's B & C,
_ between Q2's B & C,
_ across the 100k...
but the high end roll-off was too big.

maybe use 100pF and justs put on Q2, same as the mod. of Axis Fuzz.

WhiteKeyHole · Post by **WhiteKeyHole** » 01 Apr 2009, 04:52

I think you're kind of missing the point. He's trying to figure out where the 4.7nF capacitor might be in the circuit.