"Miss piggy" schematic link anyone?

[John Lyons]

Can someone point me to the "Miss Piggy" schematic. I can't find a working link in a search...
Curious how this piggybacking transistor thing works.

Thanks

John

[markm]

I've been looking for this myself......

[mattpocket]

I wanted to find out about this too, can someone explain it, I'm not as clever as these guys above...

What does it do again? haha my minds gone blank!

[puretube]

the "piggybacking"-search is your 3 page friend 

[petemoore]

  We look at Q1, FF.
 a second Q is paralleled, E/E, B/B, C/C.
 This reduces gain of the 'transistor' [actually two transistors, the circuit 'sees' only one because theyr'e piggybacked.
 Then a resistor or pot is used between the Emitters, to reduce the gain reduction effect, or to reduce gain, but to a lesser degree, something like 10k...I would exp with Qs and second' emitter resistance.

             C    /    C
 Input    B    /    B
            E           E
             Resistor
 And nicely packs an 8 pin IC socket, the bottom two R/L pins used as a resistor socket or use a pot there to adjust the R which adjusts the gain of the 'transistore'.
 The same can be done for Q2, but it's easier to find a not so low gainer Q2 transistor for FF.
 Brett is the Piggyback schematic guy IIRC.  

[John Lyons]

Ok, thanks for the explanation Pete!
I searched for it but I'll have to search under "piggybacking"

John

[petemoore]

  IIRC it was Brett did a bunch of work on that...?

[slacker]

I've got the schematics, I'm going to ask for brett's permission to post them. If anyone wants them in the meantime PM me.

[slacker]

Got the OK off brett, so here's the Miss Piggy schematics, I downloaded them a while ago so I don't know if they're the latest verions.

[marlin]

Does anyone have a stripboard layout ready for it?  (yes i feel a bit lazy) 

[brett]

Hi
That Miss Piggy V3 is quite close to what I'd suggest is a good build, except:
1.  the 2.2uF cap is too large for the fuzzface IMO.  0.47uF makes more sense electronically and musically IMO.
2.  for Q1/Q2, the 10k "piggyback" resistor should be reduced to 3.3k or 4.7k (thereby reducing the hFE of Q1/Q2)
3.  to filter some un-harmonic highs, bypass the 330 ohm resistor with 0.033 to 0.068uF (as done in the popular Axis Face)
cheers

[mac]

• As the collector is unconnected, would a diode and a resistor from base to emiter do the trick (no second transistor)?
• What if the 2nd collector is connected?
• What about a diode or resitor between the bases and/or collectors?
• ...

It seem that old Arsenio Novo's distortion circuit is just like Mr. Fozzie Bear

mac

[Cozybuilder]

Reviving an old one here! I spent a bit of time chasing dead ends, and finally contacted Brett Robinson, who sent the schematic for "Miss Piggy V3". (Do a search for photos) This is one result of some very interesting work done by Brett and RG to lower the gain of Silicon transistors to give a more Germanium type tone.

Thank you Brett!!

[aron]

I never got around to this one. Need to check it out.