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DRIVETONELEVEL

Enclosure not stated · 3 knobs

Revolution Deux

Boss SD-1 Super Overdrive

Based on the Boss SD-1· 9 other boards clone it

Category
Overdrive
Controls
Drive · Tone · Level
Price
see vendor
Read the post at Revolution Deux Schematic imageTonepad (Tube Screamer layout with SD-1 substitutions)

From the vendor

Boss's Super Overdrive, which the post describes as a Tube Screamer derivative with a few substituted values. A transistor input buffer feeds a dual op amp clipping stage with asymmetric diode clipping (two diodes one way, one the other) in the feedback loop, then the tone stage and a transistor output buffer, with the usual Boss JFET switching. Part of a guide to building a Jonny Greenwood (Radiohead, 1995-97) style pedalboard.

Schematic

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

Parts list 69 rows

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Check before you build · 2 values the reader of this schematic was not sure of
  • The transistors (Q3-Q6), the diodes (D1-D8) and the dual op amp are not given part numbers on the drawing.
  • Q1 and Q2 are the JFET switching transistors; their type is not drawn.
RefValueNormalizedTypeNotes
Resistors 31
R110K10kread from the schematic by eye
R2470K470kread from the schematic by eye
R310K10kread from the schematic by eye
R4100K100kread from the schematic by eye
R533K33kread from the schematic by eye
R64.7K4.7kread from the schematic by eye
R710K10kread from the schematic by eye
R8470470read from the schematic by eye
R910K10kread from the schematic by eye
R104.7K4.7kread from the schematic by eye
R1122K22klabel partly legible (R1?); read from the schematic by eye
R121M1Mread from the schematic by eye
R131M1Mread from the schematic by eye
R142.2K2.2kread from the schematic by eye
R1510K10kread from the schematic by eye
R161K1kread from the schematic by eye
R17100K100kread from the schematic by eye
R1833K33kread from the schematic by eye
R1933K33kread from the schematic by eye
R201M1Mread from the schematic by eye
R21100100read from the schematic by eye
R2256K56kread from the schematic by eye
R2356K56kread from the schematic by eye
R24100K100kread from the schematic by eye
R25100K100kread from the schematic by eye
R2656K56kread from the schematic by eye
R2756K56kread from the schematic by eye
R281M1Mread from the schematic by eye
R291M1Mread from the schematic by eye
R303.9K3.9kLED resistor; read from the schematic by eye
R31470470read from the schematic by eye
Capacitors 19
C147n47nread from the schematic by eye
C218n18nread from the schematic by eye
C347n47nread from the schematic by eye
C418n18nread from the schematic by eye
C527n27nread from the schematic by eye
C610n10nread from the schematic by eye
C71u1uelectrolytic, 50V; read from the schematic by eye
C847n47nread from the schematic by eye
C947n47nread from the schematic by eye
C101u1uelectrolytic, 50V; read from the schematic by eye
C1147u47uelectrolytic, 6.3V; read from the schematic by eye
C1210n10nread from the schematic by eye
C13470p470pread from the schematic by eye
C14470p470pread from the schematic by eye
C15220p220pread from the schematic by eye
C16220p220pread from the schematic by eye
C17100u100uelectrolytic, 16V; read from the schematic by eye
C1847n47nread from the schematic by eye
C1947n47nread from the schematic by eye
Diodes 8
D1??type not drawn; read from the schematic by eye
D2??type not drawn; read from the schematic by eye
D3??type not drawn; read from the schematic by eye
D4??clipping diode, type not drawn; read from the schematic by eye
D5??clipping diode, type not drawn; read from the schematic by eye
D6??clipping diode, type not drawn; read from the schematic by eye
D7??type not drawn; read from the schematic by eye
D8??type not drawn; read from the schematic by eye
Transistors 6
Q1??JFET switch, type not drawn; read from the schematic by eye
Q2??JFET switch, type not drawn; read from the schematic by eye
Q3??NPN, type not drawn; read from the schematic by eye
Q4??NPN, type not drawn; read from the schematic by eye
Q5??NPN input buffer, type not drawn; read from the schematic by eye
Q6??NPN output buffer, type not drawn; read from the schematic by eye
ICs 1
IC1??dual op amp, type not drawn; read from the schematic by eye
Potentiometers 3
DriveB1MB1MPotentiometerVR1; read from the schematic by eye
Tone20K20kPotentiometerVR3, drawn 20kW; read from the schematic by eye
LevelB10KB10kPotentiometerVR2; read from the schematic by eye
LEDs 1
LEDSLP135BSLP135BCHECK LED; read from the schematic by eye

Other boards based on the Boss SD-1