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Enclosure not stated · 3 knobs

Revolution Deux

MI Audio Crunch Box (V1)

Based on the MI Audio Crunch Box· 9 other boards clone it

Category
Distortion
Controls
Gain · Tone · Vol
Price
see vendor
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org threadPCB layout

From the vendor

The early version of MI Audio's high-gain Crunch Box distortion: two LM833 op-amp gain stages, a pair of red LEDs clipping to ground, then a simple tone control and volume. The post notes it is essentially a Marshall Guv'nor without the three-band tone stack, much like the Lovepedal Superlead.

Schematic

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

Parts list 31 rows

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RefValueNormalizedTypeNotes
Resistors 12
R11K1kread from the schematic by eye
R21M1Mread from the schematic by eye
R31K1kread from the schematic by eye
R410K10kread from the schematic by eye
R51M1Mread from the schematic by eye
R61K1kread from the schematic by eye
R7100100read from the schematic by eye
R810K10kread from the schematic by eye
R94.7K4.7kread from the schematic by eye
R1022K22kread from the schematic by eye
R1122K22kread from the schematic by eye
R124.7K4.7kLED resistor; read from the schematic by eye
Capacitors 11
C122n22nread from the schematic by eye
C21n1nread from the schematic by eye
C5220n220nelectrolytic as drawn; read from the schematic by eye
C4100p100pread from the schematic by eye
C3100n100nread from the schematic by eye
C6100p100pread from the schematic by eye
C72.2u2.2uelectrolytic; read from the schematic by eye
C839n39nread from the schematic by eye
C922n22nread from the schematic by eye
C10100u100uelectrolytic; read from the schematic by eye
C11100u100uelectrolytic; read from the schematic by eye
Diodes 1
D31N40011N4001read from the schematic by eye
ICs 1
IC1LM833LM833read from the schematic by eye
Potentiometers 3
GainB100KB100kPotentiometerVR1; read from the schematic by eye
ToneC10KC10kPotentiometerVR2; read from the schematic by eye
VolB100KB100kPotentiometerVR3; read from the schematic by eye
LEDs 3
D1red LEDRED LED5mm, clipping; read from the schematic by eye
D2red LEDRED LED5mm, clipping; read from the schematic by eye
LEDLEDLEDindicator; read from the schematic by eye

Other boards based on the MI Audio Crunch Box