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SUSTAINTONEVOLUME

Enclosure not stated · 3 knobs

Revolution Deux

Skreddy P19

Based on the Skreddy P19· 3 other boards clone it

Category
Fuzz
Controls
Sustain · Tone · Volume
Price
see vendor
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org thread

From the vendor

Marc Ahlfs' (Skreddy) Big Muff variant tuned for the lead tones of Pink Floyd's The Wall. He started from the Cornish P1 without its input buffer, then used smaller input caps for articulation and less hum, carbon composition resistors, some ceramic caps and a 0.33uF cap between the tone stack and the output stage to loosen the lows. It is a four-BC550 Muff with a Mids switch on the tone stack.

The clipping diodes are unmarked on the schematic: Marc keeps a slightly asymmetric 'Skreddy recipe' secret; the gutshot looks like 1N4148 types, and the post suggests a slightly mismatched pair of 1N4148s. It can be built on nearly any Big Muff layout with the right part substitutions.

Schematic

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

Parts list 58 rows

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Check before you build · 1 value the reader of this schematic was not sure of
  • C8 and C16 are both read as 6.8n.
RefValueNormalizedTypeNotes
Resistors 26
R133K33kread from the schematic by eye
R2100K100kread from the schematic by eye
R3470K470kread from the schematic by eye
R410K10kread from the schematic by eye
R5200200read from the schematic by eye
R6820820read from the schematic by eye
R756K56kread from the schematic by eye
R8470K470kread from the schematic by eye
R9200200read from the schematic by eye
R1010K10kread from the schematic by eye
R1110K10kread from the schematic by eye
R12100K100kread from the schematic by eye
R13470K470kread from the schematic by eye
R14200200read from the schematic by eye
R1510K10kread from the schematic by eye
R1633K33kread from the schematic by eye
R1718K18kread from the schematic by eye
R18100K100kread from the schematic by eye
R19470K470kread from the schematic by eye
R2010K10kread from the schematic by eye
R212.7K2.7kread from the schematic by eye
R2210K10kread from the schematic by eye
R23100100read from the schematic by eye
R24100100read from the schematic by eye
R25100100read from the schematic by eye
RLED18K18kLED resistor; read from the schematic by eye
Capacitors 18
C168n68npoly; read from the schematic by eye
C2560p560pread from the schematic by eye
C347n47npoly; read from the schematic by eye
C4560p560pread from the schematic by eye
C5100n100nceramic; read from the schematic by eye
C6100n100nceramic; read from the schematic by eye
C7100n100nceramic; read from the schematic by eye
C86.8n6.8nread from the schematic by eye
C9560p560pread from the schematic by eye
C10100n100npoly; read from the schematic by eye
C112n2nread from the schematic by eye
C12330n330ndrawn .33 dme; read from the schematic by eye
C13100n100npoly; read from the schematic by eye
C14100u100uelectrolytic, power filter; read from the schematic by eye
C166.8n6.8nread from the schematic by eye
C1710n10nread from the schematic by eye
C18560p560pread from the schematic by eye
C22100n100nceramic, power filter; read from the schematic by eye
Diodes 5
D1??unmarked; 1N4148 type per the post; read from the schematic by eye
D2??unmarked; 1N4148 type per the post; read from the schematic by eye
D3??unmarked; 1N4148 type per the post; read from the schematic by eye
D4??unmarked; 1N4148 type per the post; read from the schematic by eye
D5??Schottky, reverse polarity protection; read from the schematic by eye
Transistors 4
Q1BC550BC550read from the schematic by eye
Q2BC550BC550read from the schematic by eye
Q3BC550BC550read from the schematic by eye
Q4BC550BC550read from the schematic by eye
Potentiometers 3
SustainB100KB100kPotentiometerread from the schematic by eye
ToneB50KB50kPotentiometerread from the schematic by eye
VolumeA100KA100kPotentiometerread from the schematic by eye
Switches 1
MidsSPDTSPDTPS1/PS2; read from the schematic by eye
LEDs 1
LEDLEDLEDred; read from the schematic by eye

Other boards based on the Skreddy P19