Hello,
a Friend gave me an old Schaller Fuzz because i wanted to test it and
look for the Circuit...
Its a real fine sounding Fuzz that sounds similar to the RogerMayer ClassicFuzz, but using BC239B Si Trannys
I made some pictures from it and traced the circuit (first time for me doing such work) And drawed a schematic.
If anybody is interested, visit the Link below (all entrys with SchallerFuzz_... are from that one)
http://mitglied.lycos.de/surftone/gitarre/effekte
bye and see if its interesting for You!
Oliver
Great Page to look at !!!
Looks [from my view] to be a unique circuit.
Nice Pics !
Wierd switch though... :?
Quote from: petemooreGreat Page to look at !!!
Looks [from my view] to be a unique circuit.
Nice Pics !
HI,
great Page? - its only the folder, because a real html page would show you tons of commercial trash before you can go for the real content.
:lol:
the circuit seems to be a FuzzFace one, but the two ceramic caps between Q1 and Q2 are unique.
And im not shure, if the Caps are 25uF at all, but i only can read one of them, the two others have to be desoldered, but its not my pedal and so i dont want do damage this old piece.
And compared to my DIY RogerMayerClassicFuzz there is only slighly difference (the Schaller has a bit more Presence, and the RMCF has some more OutputVolume, thats all)
Sounds very smooth for Si Fuzz
aloha
Oliver
C1 and C2 are unusual. Wonder how it biases?
The base R for Q1 does come from Q2 emitter...I was looking for that horizontal R [~100k] there...yupp.
Those are some might big DC Blocking/roloff [not much rolloff] caps.
I'm thinking 2.5uf is more typical for guitar use...
Hi,
so the In- and Output Caps may be 2.5uF and that one at the Intensity Control is 25uF ...
The Caps in the Middle are labled with 102 (that C1) and the other one
is under the Circuit and there is a Number on the Board (0108) can be the Lableing from the C2..
What could i use instead of BC239B Trannys to build a clone?
And the Friend asked me if i could build that circuit for BASS Use..
Can i build a Bass Fuzz with that Schematic?
Thanx
Oliver
Very cool Oliver!
I think your schematic need some work. I'm coming up with a fuzzface clone with a cap and resistor in series between the collector of Q1 and the base of Q2.
Edit: Oops, I mean parallel!
Cool pics, thanks.
O.K., all I see wrong is you don't have R3 on your schem. It is parallel with that 102 (.002) cap. 100K must really beat down the signal!
Thanks! Now we need to trace one of the germanium models. And the Schaller Tremolo!
Dan
Hi,
i come back because the thing with the forgotten R3 in my drawn schematic.. its parallel to C1, as suggested from one of You :D
bye
Oliver
Great Job!
Are you sure with the value of C2? You wrote 108 which are 1000uF!
I thought this should be a pico value to protect against RF (like some Colorsound pedals do).
But it's kind of strange that the base of Q2 is completely DC-coupled :?
Regards,
tomboy
Quote from: tomboyGreat Job!
Are you sure with the value of C2? You wrote 108 which are 1000uF!
I thought this should be a pico value to protect against RF (like some Colorsound pedals do).
But it's kind of strange that the base of Q2 is completely DC-coupled :?
Regards,
tomboy
HI,
if You look at the Picture
(http://mitglied.lycos.de/surftone/gitarre/effekte/SchallerFuzz_Platine.jpg)
the C2 is a small Ceramic Cap (lightgrey with a red "head") and on the
PCB are the digits 0108 - i associated that with the Cap, dont really know if its right (it connects C and B from Q2)
I can be wrong - perhaps it can be cloned and tried out.
But sounds very similar to a RogerMayerClassicFuzz - really (i compared them)
bye
Oliver
I'm quite sure that C2 is some kind of picofarad value (since the cap is so small). Someone mentioned that C1 has a resistor parallel - was it's value 100k?
Anyway I would expect it to sound like a Roger Mayer Fuzz since the circuit looks quite simillar. If you take a schematic of the RM Fuzz and draw yours up in the same way you'll see. Only the R3||C2 and the reversed Fuzzpot is different.
Regards,
tomboy
P.S.: I saw you're from germany - we're do you live? I live near Karlsruhe.
Hi,
at the point with the FuzzPot i might be wront with the right Pinout...
I only drawn it how i thought. It should be the same way as in any other Fuzz too. (sorry, but im not very good in drawing those schematics)
Im glad if i solder after a plan and the circuit works :-)
perhaps its easyer to verify the Resistorvalues on the Picture?
(http://mitglied.lycos.de/surftone/gitarre/effekte/Bild1.jpg)
i hope Q1 and Q2 are labled correctly!! :?
R1 to R5 is how i wrote them down to dedicate the values after the
colorrings....
bye
Oliver
Hi again!
Yesterday I simulated it and it worked (surprise, surprise :wink: )!!!
I use 220pF for C2 (which is a common value).
R3 is 100k as someone mentioned but I think R1 is 4k7 (maybe I just didn't saw the dot on your schematic).
(The orientation of the Fuzzpot is easy - just solder the pos. side of the cap to the wiper and the neg. side to GND)
But it works anyway...
Regards,
tomboy
Quote from: tomboyHi again!
Yesterday I simulated it and it worked (surprise, surprise :wink: )!!!
I use 220pF for C2 (which is a common value).
R3 is 100k as someone mentioned but I think R1 is 4k7 (maybe I just didn't saw the dot on your schematic).
(The orientation of the Fuzzpot is easy - just solder the pos. side of the cap to the wiper and the neg. side to GND)
But it works anyway...
Regards,
tomboy
Hi :D
very glad that it runs !
R1 should be 4K7 - the Dot didnt come trough after the scan :roll:
How does it sound? Can You explain?
The Sound of the Schaller reminds me of my RogerMayer ClassicFuzz Build. So typical FuzzFace, but very warm and snooth compared to usual Si FuzzFace types.
What Trannys did You put in?
bye
Oliver
Quote from: Oliver
How does it sound? Can You explain?
The Sound of the Schaller reminds me of my RogerMayer ClassicFuzz Build. So typical FuzzFace, but very warm and snooth compared to usual Si FuzzFace types.
What Trannys did You put in?
bye
Oliver
Well after I just
simulated it I can't tell how it sounds. What I meant was I proofed it with a software (which doesn't gives an audio signal out).
But looking at the scope it gives a nice(!) square wave - trannys were 2N5088 for one test and 2N3904 for another.