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EXPANDERBALANCE

Enclosure not stated · 2 knobs

Revolution Deux

Univox Super-Fuzz

Based on the Univox Super-Fuzz· 37 other boards clone it

Category
Fuzz
Controls
Expander · Balance
Price
see vendor
Also as
Vero layout · from Revolution Deux
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagePCB layoutfreestompboxes.org threadPCB layout source (uzzfay) Vero layout

From the vendor

The Shin-ei designed Super-Fuzz made by Unicord for Univox from 1968 into the late 1970s, used by Pete Townshend among many others. A two-transistor input gain stage feeds a phase splitter driving a long-tailed pair, whose shared collector gives full-wave rectification and the upper octave, then a pair of germanium diodes clip it. A tone switch engages a mid-scooping filter around 1 kHz, and a final transistor stage drives the output. The post quotes mictester: high-gain transistors for the first two and a matched long-tailed pair give more octave; silicon clipping diodes make the biggest change.

mictester: the circuit works best with high hFE transistors for the first two (he used BC109C) and lower gain for the rest; almost any silicon transistor works. Matching the long-tailed pair transistors and the resistors around them gives much more octave. Swapping the germanium clipping diodes for silicon gives the biggest change in sound.

Schematic

The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.

Parts list 56 rows

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Check before you build · 1 value the reader of this schematic was not sure of
  • The schematic draws the clipping diodes as OA-90 (revised in 2003); the vero layout lists OA-91.
RefValueNormalizedTypeNotes
Resistors 29
R122K22kinput; read from the schematic by eye
R2100K100kread from the schematic by eye
R31.8K1.8kread from the schematic by eye
R4100K100kread from the schematic by eye
R547K47kread from the schematic by eye
R647K47kfeedback; read from the schematic by eye
R7470K470kread from the schematic by eye
R810K10kread from the schematic by eye
R9220K220kread from the schematic by eye
R10150K150kread from the schematic by eye
R1110K10kread from the schematic by eye
R1210K10kread from the schematic by eye
R1310K10kread from the schematic by eye
R1447K47kread from the schematic by eye
R1522K22kread from the schematic by eye
R16470470read from the schematic by eye
R17100K100kread from the schematic by eye
R1822K22kread from the schematic by eye
R191.8K1.8kread from the schematic by eye
R2010K10kread from the schematic by eye
R2110K10kread from the schematic by eye
R22100K100kread from the schematic by eye
R23470470read from the schematic by eye
R241K1kread from the schematic by eye
R2522K22kread from the schematic by eye
R26100K100kread from the schematic by eye
R2710K10kread from the schematic by eye
R2815K15kread from the schematic by eye
R29100K100koutput pulldown; not on the vero list; read from the schematic by eye
Capacitors 16
C110u10uelectrolytic; read from the schematic by eye
C2100n100nread from the schematic by eye
C310u10uelectrolytic; read from the schematic by eye
C41n1nread from the schematic by eye
C510u10uelectrolytic; read from the schematic by eye
C610u10uelectrolytic; read from the schematic by eye
C710u10uelectrolytic; read from the schematic by eye
C810u10uelectrolytic; read from the schematic by eye
C910u10uelectrolytic; read from the schematic by eye
C1010u10uelectrolytic; read from the schematic by eye
C1110u10uelectrolytic; read from the schematic by eye
C12100n100nread from the schematic by eye
C131n1nread from the schematic by eye
C1410u10uelectrolytic; read from the schematic by eye
C1510u10uelectrolytic; read from the schematic by eye
C1610u10uelectrolytic, power filter; read from the schematic by eye
Diodes 2
D1OA90OA90germanium; read from the schematic by eye
D2OA90OA90germanium; read from the schematic by eye
Transistors 6
Q12SC8282SC828read from the schematic by eye
Q22SC8282SC828read from the schematic by eye
Q32SC8282SC828read from the schematic by eye
Q42SC8282SC828read from the schematic by eye
Q52SC8282SC828read from the schematic by eye
Q62SC8282SC828read from the schematic by eye
Potentiometers 2
ExpanderB50KB50kPotentiometerread from the schematic by eye
BalanceB50KB50kPotentiometerread from the schematic by eye
Switches 1
ToneSPDTSPDTtone switch; read from the schematic by eye

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