Fuzzface Resistor question

Started by theregoesnorman, April 02, 2009, 04:07:46 PM

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theregoesnorman

Hi guys, searched and couldn't find a similar thread.

I bought a pair of sino ge transistors from Small Bear, and the resistors he suggests are:

R3 - 30k
R4 - 680
R5 - 10k
R6 - 91k

I have a FF pcb from tonepad (http://www.tonepad.com/getFile.asp?id=82) and was hoping to use that, but the PCB only has 5 resistors. 

Am I trying to put a square peg in a round hole, or should those resistor values be substituted for some of the present ones?  If so, which?

Thanks in advance!

slacker

I think the resistor numbers match the Bearface schematic, the values certainly look correct in those positions.
If you compare that with the tonepad schematic you should see which resistor goes where.

8bitapocalypse

the extra resistor is probably a drop down resistor to eliminate switch popping.

here are how the values translate to the tonepad pcb

R3 - 30k   - tp = R2 = 33k
R4 - 680   - tp = R4 = 470r
R5 - 10k   - tp = R5 = 8k2
R6 - 91k   - tp = 100k

hope this helps.

petemoore

R3 - 30k   - tp = R2 = 33k Small % difference, next smallest common value = 27k
R4 - 680   - tp = R4 = 470r  Kicks output volume up a notch.
R5 - 10k   - tp = R5 = 8k2  Should bias with this value nice value.
R6 - 91k   - tp = 100k   Then the FF feedback resistor.
  You have PNP Pos gnd.
  Or NPN neg gnd.
  ?.
 
 
Convention creates following, following creates convention.