Use this calculator to estimate the bias resistors of a Fuzz Face.

Calculation includes the effect of germanium transistors leakage current in mA (the iL text field). For silicon transistors use a value of 0 for iL. Precise values are required to achieve reasonable accuracy. Vc1 and Vc2 values are very sensitive to small changes in hFE and iL.

R1   K

R2   K

R3   K

R4   K

Vcc  V

Q1:-------------

hFE 

Vbe  V

iL   mA

Q2:-------------

hFE 

Vbe  V

iL   mA

Vc1  V

Vc2  V

ic1  mA

ic2  mA

ib1  mA

ib2   mA

ie1  mA

ie2  mA

i1   mA

i3   mA

V4   V

Ve2  V

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