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VOLTSDRIVEFUZZTONELEVEL

Enclosure not stated · 5 knobs

Revolution Deux

Durham Crazy Horse

Based on the Durham Crazy Horse· 6 other boards clone it

Category
Fuzz
Controls
Volts · Drive · Fuzz · Tone · Level
Price
see vendor
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org threadBarcode's PCB layout

From the vendor

Durham's overdrive, boost and fuzz, inspired by Neil Young's tone. A JRC4558 op-amp stage with diode clipping in its feedback loop and a Drive control feeds a unity-gain op-amp stage and then a Fuzz Face-style transistor fuzz (two 2N2222As) with a Fuzz control on Q2's emitter, a Darlington emitter follower (MPSA13s) and a passive tone and level. A Volts control sags the supply. The author wonders why the second op amp is not used to buffer the tone section instead.

Schematic

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

Parts list 44 rows

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Check before you build · 1 value the reader of this schematic was not sure of
  • The two output transistors are both labeled Q3 on the drawing; the parts legend lists Q3 and Q4 (MPSA13).
RefValueNormalizedTypeNotes
Resistors 18
R1560560read from the schematic by eye
R222K22kbias divider; read from the schematic by eye
R322K22kbias divider; read from the schematic by eye
R41M1Mto Vr; read from the schematic by eye
R522K22kread from the schematic by eye
R61K1kread from the schematic by eye
R71K1kIC1B feedback; read from the schematic by eye
R839K39kread from the schematic by eye
R933K33kread from the schematic by eye
R1022K22kQ1 collector; read from the schematic by eye
R111K1ksupply; read from the schematic by eye
R123.3K3.3kQ2 collector; read from the schematic by eye
R13100K100kread from the schematic by eye
R141.5K1.5kread from the schematic by eye
R151K1ksupply; read from the schematic by eye
R161.5K1.5kread from the schematic by eye
R1747K47kread from the schematic by eye
R1822K22kread from the schematic by eye
Capacitors 10
C122u22uelectrolytic; read from the schematic by eye
C21u1uinput; read from the schematic by eye
C3100n100n.1uF; read from the schematic by eye
C422u22uelectrolytic; read from the schematic by eye
C5100n100n.1uF; read from the schematic by eye
C622u22uelectrolytic; read from the schematic by eye
C7100n100n.1uF; read from the schematic by eye
C8220n220n.22uF; read from the schematic by eye
C910n10n.01uF; read from the schematic by eye
C1022n22n.022uF; read from the schematic by eye
Diodes 5
D11N9141N914read from the schematic by eye
D31N9141N914read from the schematic by eye
D41N9141N914read from the schematic by eye
D51N9141N914one end not connected; read from the schematic by eye
D61N9141N914read from the schematic by eye
Transistors 4
Q12N2222A2N2222Aread from the schematic by eye
Q22N2222A2N2222Aread from the schematic by eye
Q3MPSA13MPSA13read from the schematic by eye
Q4MPSA13MPSA13drawn as a second Q3; read from the schematic by eye
ICs 1
IC1JRC4558DJRC4558Dread from the schematic by eye
Potentiometers 5
VoltsB1KB1kPotentiometerread from the schematic by eye
DriveB250KB250kPotentiometerread from the schematic by eye
FuzzB1KB1kPotentiometerread from the schematic by eye
ToneB25KB25kPotentiometerread from the schematic by eye
LevelB500KB500kPotentiometerread from the schematic by eye
LEDs 1
D2LEDLED3mm green diffused, in the supply line; read from the schematic by eye

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