Shin-ei Fuzz Parts

[chaddhamilton]

I'm trying to get the components to build this pedal.  I can't seem to find the transistor labled C536 F7G.  I'm following the schematic found here:http://members.fortunecity.com/uzzfay/fy2/fy-2schem.html

Anyone know of suitable replacement? 

Thanks,
Chad

[spudulike]

http://www.datasheetarchive.com/semiconductors/specsheet.php?specsheet=139945

Part Number = 2SC536F
Description = Si NPN Lo-Pwr Bipolar Junction Transistor
Manufacturer = Continental Device India Limited
V(BR)CEO (V) = 30
V(BR)CBO (V) = 40
I(CBO) Max. (A) = 100n
@V(CBO) (V) (Test Condition) = 35
V(CE)sat Max.(V) = .50
@I(C) (A) (Test Condition) = 50m
h(FE) Min. Static Current Gain = 160
h(FE) Max. Current gain. = 320@I(C) (A) (Test Condition) = 1.0m
@V(CE) (V) (Test Condition) = 6.0
f(T) Min. (Hz) Transition Freq = 100M
@I(C) (A) (Test Condition) = 1.0m
C(obo) (Max) (F) = 3.5p
Package = TO-92
Military = N

Try a 2N3904 - a 2N5088 may be too high gain ?

[MartyMart]

They're NPN, so good 'ole 2N5088 or a BC549B/2N3904 should be close enough.
If you want to try Ge NPN then perhaps trimpots to the collectors would be
a better idea.

Marty.

[petemoore]

 Â According to NTE these are 'general switching' NPN's, so 2n3904 'should' work, but I'd socket and try BCxxx's or higher gain ones like 2n5089 to see what it likes.
 THe schematic shows NPN Neg Gnd.

[chaddhamilton]

Thanks, I really appreciate the info.

Also, has anyone built from this schematic(there's a similar one floating around on the web)?  This is my second pedal project, my first being the GGG fuzz face and I'd like a little assurance that it's a functional schematic.

Chad

[Dan N]

The 2 schematics I've seen (greenfuzz and uzzfay) are drawn differently, but are identical and accurate.

If you search this forum, you may find a couple mods suggested by Mark Hammer. One is a rewiring of the fuzz pot. The other is bypassing the filter section (the 4 parts between the pots). The vol pot mod is subtle. Bypassing the filter is huge.

Good luck!

[Mark Hammer]

This is my second pedal project, my first being the GGG fuzz face and I'd like a little assurance that it's a functional schematic.

It is, and you're gonna love it.  My guess is a C1815 or some other medium hfe type (2N4401, C945, etc) would work just fine.  All the caps in mine are big ugly ceramic ones.  That doesn't mean you MUST use ceramic.  Rather, don't drive yourself nuts looking for special types.  Use whatever you have lying around.

[octafish]

I'd say its sort of correct, It'll work but the modified fuzz pot (so its more like a mosrite) is much better IMHO. I ended up using 2N3904's and it is one nasty fuzz. I built it in the same box as a LPB-1 ahead of it. Driving this circuit with a booster adds a real extra dimension.
BTW single notes only, no chords, yes this is a solo fuzz.

[Mark Hammer]

Well you can certainly play chords.  Whether you can find them in there under all of that is another story, though. 

Glad to hear you like the flipped pot.  When I first got the schem (needed to repair one I had bought years earlier), I thought "That can't be right", but figured that, if it worked then that's what it needed to be.  Then one day I flipped two leads around, Mos-Rite style, and found I liked it more.  And yes, it gets sick beyond belief with a boosted input.  I need to install a scoop-cancel switch in mine.

[Dan N]

I need to install a scoop-cancel switch in mine.

Serious volume boost! Still harsh and raspy. Thanks for the idea!

The Superfuzz has a 47K resistor when it bypasses the filter. Time to try jumpering it on my homebuild!

[Mark Hammer]

Even with the mid-scoop filter, it's pretty darn loud.  Wouldn't surprise me in the least if you could stick a T/M/B passive tonestack in there and still yield decent output levels.  Although, doing something like the Superfuzz and having a scoop-bypass that inserts some fixed attenuation for level balance wouldn't be the worst idea ever sugested.