Akashic Guitar effects circuit lookup
DRIVETONEVOL

Enclosure not stated · 3 knobs

Revolution Deux

Bearfoot FX Model H

Based on the BearFoot FX Model H· 3 other boards clone it

Category
Overdrive
Controls
Drive · Tone · Vol
Price
see vendor
Also as
Vero layout · from Revolution Deux
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic image Vero layout

From the vendor

Bjorn Juhl's Model H for Bearfoot FX, voiced after a Hiwatt amp. A 2N5952 JFET input stage with the Drive pot in its source feeds a CA3130 op-amp stage with red LED clipping in its feedback loop, then a JFET stage with a tone network and a JFET output stage. The post notes it is almost the same structure as BJF's Mad Professor Blueberry, or a hot-rodded Honey Bee.

The vero layout suggests replacing R15 with a 5K pot or trimmer for a treble control.

Schematic

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

Parts list 51 rows

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RefValueNormalizedTypeNotes
Resistors 24
R11M1Mread from the schematic by eye
R2200K200kread from the schematic by eye
R314.7K14.7kread from the schematic by eye
R422K22kread from the schematic by eye
R547K47kread from the schematic by eye
R62.2K2.2kread from the schematic by eye
R71.5K1.5kread from the schematic by eye
R85.6K5.6kread from the schematic by eye
R93K3kread from the schematic by eye
R101.5K1.5kread from the schematic by eye
R1147K47kread from the schematic by eye
R1210K10kread from the schematic by eye
R131M1Mread from the schematic by eye
R14150K150kread from the schematic by eye
R151.5K1.5kread from the schematic by eye
R1656K56kread from the schematic by eye
R171K1kread from the schematic by eye
R183K3kread from the schematic by eye
R193.6K3.6kread from the schematic by eye
R2014.7K14.7kread from the schematic by eye
R21200K200kread from the schematic by eye
R224747read from the schematic by eye
R2347K47kbias divider; read from the schematic by eye
R2447K47kbias divider; read from the schematic by eye
Capacitors 16
C122n22nread from the schematic by eye
C21u1uelectrolytic; read from the schematic by eye
C322n22nread from the schematic by eye
C41u1uelectrolytic; read from the schematic by eye
C51u1uelectrolytic; read from the schematic by eye
C6220n220nread from the schematic by eye
C74.7n4.7nread from the schematic by eye
C822n22nread from the schematic by eye
C947n47nread from the schematic by eye
C10100p100pread from the schematic by eye
C11220n220nread from the schematic by eye
C124.7u4.7uelectrolytic; read from the schematic by eye
C13470p470pread from the schematic by eye
C1422n22nread from the schematic by eye
C15100u100uelectrolytic, power filter; read from the schematic by eye
C1622u22uelectrolytic, bias filter; read from the schematic by eye
Diodes 1
D31N40071N4007read from the schematic by eye
Transistors 4
Q12N59522N5952JFET; read from the schematic by eye
Q22N59522N5952JFET; read from the schematic by eye
Q32N59522N5952JFET; read from the schematic by eye
Q42N59522N5952JFET; read from the schematic by eye
ICs 1
IC1CA3130EZCA3130EZread from the schematic by eye
Potentiometers 3
DriveC50KC50kPotentiometerreverse audio; read from the schematic by eye
ToneC50KC50kPotentiometerreverse audio; read from the schematic by eye
VolB50KB50kPotentiometerread from the schematic by eye
LEDs 2
D1LEDLEDred 3mm, clipping; read from the schematic by eye
D2LEDLEDred 3mm, clipping; read from the schematic by eye

Other boards based on the BearFoot FX Model H