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DRIVEPRESENCELEVEL

Enclosure not stated · 3 knobs

Revolution Deux

Crowther Hotcake (2003)

Based on the Crowther Hotcake· 12 other boards clone it

Category
Overdrive
Controls
Drive · Presence · Level
Price
see vendor
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org threadSoulSonic PCB layout

From the vendor

The 2003 Hotcake: the same clipped op-amp core (a TL071, LM741 on older units) with an 8.2V zener-regulated supply, a Presence control in place of the Mid Lift switch, and bistable-relay switching. Bajaman hears it as glassier and more Fender-like than the 1977 version.

Per the drawing, Presence (P2) may be 50K linear on later units, and older units use an LM741.

Schematic

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

Parts list 30 rows

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Check before you build · 1 value the reader of this schematic was not sure of
  • Q1, R12, R13 and C8 in the relay driver have no values on the drawing.
RefValueNormalizedTypeNotes
Resistors 13
R1220220read from the schematic by eye
R282K82kread from the schematic by eye
R3100K100kread from the schematic by eye
R510K10kread from the schematic by eye
R41M1Mread from the schematic by eye
R7100K100kread from the schematic by eye
R6220220read from the schematic by eye
R810K10kread from the schematic by eye
R91K1kread from the schematic by eye
R1010K10kread from the schematic by eye
R114.7K4.7kread from the schematic by eye
R12??no value drawn; read from the schematic by eye
R13??no value drawn; read from the schematic by eye
Capacitors 8
C210u10uelectrolytic; read from the schematic by eye
C110n10nread from the schematic by eye
C310u10uelectrolytic; read from the schematic by eye
C482n82nread from the schematic by eye
C5470p470pread from the schematic by eye
C622n22nread from the schematic by eye
C756n56nread from the schematic by eye
C8??electrolytic, no value drawn; read from the schematic by eye
Diodes 1
D11N52381N5238 / 8V78.2V zener (ZPY 8V2); read from the schematic by eye
Transistors 1
Q1??relay driver, type not given; read from the schematic by eye
ICs 1
IC1TL071TL071LM741 on older units; read from the schematic by eye
Potentiometers 3
DriveC50KC50kPotentiometerP1, 50K reverse log; read from the schematic by eye
PresenceB22KB22kPotentiometerP2; may be B50K on later units; read from the schematic by eye
LevelA50KA50kPotentiometerP3; read from the schematic by eye
Switches 1
S1momentaryMOMENTARYfootswitch for the relay; read from the schematic by eye
LEDs 1
LED1LEDLEDread from the schematic by eye
Other 1
Rel1bistable relayBISTABLE RELAYimpulse triggered; read from the schematic by eye

Other boards based on the Crowther Hotcake