Fuzzrite - which schematic is correct?

[LucifersTrip]

I built this PNP [NTE102A] version, which sounds killer.
1) http://eu11.stripper.jp/pulcino/blog/images/fuzzrite.gif

I wanted to try this NPN version:
2) http://www.schematicheaven.com/effects/mosrite_fuzrite.pdf

...which I don't get any sound at all from. I've checked wiring, soldering & values numerous times and had someone
else check check if for me and no problems were found yet (tho, of course that's still a possibility).
I tried 2SC1815 [which crosses to the same transistor as TZ82, the NTE85*] and 2N3904 since it was used in this:
3) http://www.freeinfosociety.com/electronics/schematics/audio/pictures/gcsritefuzz.gif

*The NTE cross  search shows:
TZ82(Trans) > NTE85
TZ82 > NTE150A

what's the diff between TZ82(Trans) and TZ82?

Regardless, in searching for solutions, I found this almost identical schematic to 2):
4) http://fuzzcentral.ssguitar.com/schematics/fuzzriteschem.gif

...except in 2), the "-" terminal of the battery goes to the tip of the input jack and in 4) it goes to the casing.

Which is correct?   both?

thanx

[John Lyons]

The pin out is different I believe.
The 2SC1815 is BCE and the 2N3904 is CBE
Make sure you have the Collector base and emitter in the right places.

[LucifersTrip]

The pin out is different I believe.
The 2SC1815 is BCE and the 2N3904 is CBE
Make sure you have the Collector base and emitter in the right places.

Thanx for the suggestions. I know I hooked up the 2N3904 correctly...not 100% sure about the 2SC1815 ....but I did figure out the problem.

Whoever did this one was very sloppy !
2) http://www.schematicheaven.com/effects/mosrite_fuzrite.pdf

Firstly, I could not get it to work with the "-" terminal of the battery to the tip of the input jack.
Secondly, the center pot between the two .002 caps is written wrong as 350. It should be 350K as in
4) http://fuzzcentral.ssguitar.com/schematics/fuzzriteschem.gif

I changed the battery hook-up and the 350 to 350K and got that amazing fuzzrite sound right off.

thanx

[doug deeper]

there should be a 22k resistor to ground from the right of the 350k pot.
that will really help with the fuzzrite-ish-ness.

[LucifersTrip]

there should be a 22k resistor to ground from the right of the 350k pot.
that will really help with the fuzzrite-ish-ness.

sounds cool. I'll definitely try it out. I'll put a 25-50k  pot there instead and tweak it.

I did get a great gated fuzz sound by putting a 1M pot across the top side of the top right vertical 470K and the right side  of the top right horizontal 470K, and slowly lowering the resistance. Changing any of the other existing resistors did nothing for me except lower the volume.

btw, i ended up with the 2SC1815, which gave me the hottest sound with the most room for change. I will try a bunch more before finalizing.

thanx

[LucifersTrip]

there should be a 22k resistor to ground from the right of the 350k pot.
that will really help with the fuzzrite-ish-ness.

sounds cool. I'll definitely try it out. I'll put a 25-50k  pot there instead and tweak it.

I added a 25K pot to the right of the 350k and it did work great. For me it worked best at 11.8K and turned the tone into a trashier, more trebely one.
Combined with the 1M pot I added across the 470K's set at 413K gave me almost exactly what I wanted...a trashy gated fuzz!

Though, I will put a switch on both of those mods since both while connected make it impossible to get the good original tones I got without..

thanx again

[brett]

Hi
try to keep the hFE of the ransistors low.  Otherwise the fuzziness gets a bit out of control.  The original transistors would have been hFe 100 to 200.  So old BC109s, 2N2222A or a mid-power device like a BD139 will be good.
cheers

[LucifersTrip]

Hi
try to keep the hFE of the transistors low.  Otherwise the fuzziness gets a bit out of control.  The original transistors would have been hFe 100 to 200.  So old BC109s, 2N2222A or a mid-power device like a BD139 will be good.
cheers

schematic:
http://fuzzcentral.ssguitar.com/schematics/fuzzriteschem.gif

what do you mean by "out of control"? I actually do want it out of control as long it doesn't hiss/hum/screach too much while I'm not hitting the strings. I used 2SC1815 because they crossed to the same NTE part as the TZ82 (NTE85). The hFe was in the 160 range.

thanx much