madbeanpedals Zygote, Руководство пользователя

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http://www.madbeanpedals.com
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FUZZ
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2010 madbeanpedals
Release date: 12.10.10
REVISED: 03.24.11
The Zygote is an “all­in­one” fuzz. It allows you to build several types of Fuzz Face circuits on one board, with
as little as two controls, and up to five controls and two switches. Additionally, you can build either positive
ground PNP or negative ground NPN.
The design incorporates elements from both the Fulltone ’69 and ’70 pedal as well as some other mods. You
can choose to build either one using the instructions below, or make a hybrid of the two. Additional controls will
add to the overall flexibility of the circuit, although you may find the Tweak knob a little redundant in some
settings (if using the B/M switch).
The controls are as follows
STRAIN : Turning this control up reduces the amount of overall fuzz (similar to the Bias control on the ’69). This
is done by adding a 50k pot in series with the input of the circuit. This may also be useful in dialing down the
input from a humbucker.
DRAIN: Turning this control up reduces the voltage to the circuit (voltage sag) from the nominal 9v by using a
5k pot in series with the voltage supply. At max, it will reduce the voltage to around 5.5v.
FUZZ : The overall fuzz amount.
TWEAK : Works in conjunction with the B/M switch. In Boost mode, this control adds output similar to the
“Contour” knob on a ’69. In Mids mode it reduces output similar to the “Mids” control on the ’70.
VOL: Overall output.
B/M (Boost/Mids): This either puts a 1k pot in series with a 220R resistor for Boost , or a 1k pot in series with
a 220R and in parallel with an additional 1k resistor for Mids .
FAT: This switch allows you to select two different input caps to control the bass feeding into the circuit. The
second cap (2u2 or other) is added in parallel with the first to increase the overall value.
Parts
·
Xicon or Sprague axial electrolytic caps, 16v
·
Mallory axial film caps, or similar
·
Xicon carbon film or carbon comp resistors, ¼ W
·
16mm Alpha pots
· Matched pair of PNP transistors (Hfe of ~70 on Q1 and ~120 on Q2)