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HILODRIVEVOLUME

125B · 4 knobs

PedalPCB· PCB053

MOSFET Driver

Based on the BK Butler Tube Driver· 1 other board clones it

Category
Distortion
Controls
Hi · Lo · Drive · Volume
Price
$8.00in stock
Tags
125B, 125B 4-Knob (Type 1)
Buy the PCB at PedalPCB Build document5/13/24 Tayda drill template

From the vendor

The MOSFET Driver is based on the legendary BK Butler Tube Driver. A pair of adjustable-bias MOSFET gain stages take the place of the 12AX7 vacuum tube, otherwise the circuit is true to the original schematic.

Controls

• Hi – Adjusts the treble content

• Lo – Adjusts the bass content

• Drive – Controls the amount of gain

• Volume – Controls the overall output volume

Specifications

• Designed for a 125B enclosure with top-mounted jacks

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 44 rows

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RefValueNormalizedTypeNotes
Resistors 19
R11M1MResistor, 1/4W
R210K10kResistor, 1/4W
R31M1MResistor, 1/4W
R410K10kResistor, 1/4W
R51K51.5kResistor, 1/4W
R61K51.5kResistor, 1/4W
R7470K470kResistor, 1/4W
R81M1MResistor, 1/4W
R91M1MResistor, 1/4W
R105K15.1kResistor, 1/4W
R111M1MResistor, 1/4W
R121M1MResistor, 1/4W
R135K15.1kResistor, 1/4W
R1422K22kResistor, 1/4W
R152K22.2kResistor, 1/4W
R16220K220kResistor, 1/4W
R10010K10kResistor, 1/4W
R10110K10kResistor, 1/4W
CLR4K74.7kResistor, 1/4W* LED current limiting resistor
Capacitors 13
C133n33nFilm capacitor, 7.2 x 2.5mm
C247p47pCeramic capacitor
C34u74.7uElectrolytic capacitor, 5mm
C4120p120pCeramic capacitor
C510n10nFilm capacitor, 7.2 x 2.5mm
C6470p470pCeramic capacitor
C722n22nFilm capacitor, 7.2 x 2.5mm
C847n47nFilm capacitor, 7.2 x 2.5mm
C947n47nFilm capacitor, 7.2 x 2.5mm
C10330p330pCeramic capacitor
C11100n100nFilm capacitor, 7.2 x 2.5mm
C100100u100uElectrolytic capacitor, 5mm
C10147u47uElectrolytic capacitor, 5mm
Diodes 3
D11N47391N4739Zener diode 1W, 9.1V
D21N47391N4739Zener diode 1W, 9.1V
D1001N58171N5817Schottky diode, DO-41
Transistors 2
Q1BS170BS170N-Channel MOSFET
Q2BS170BS170N-Channel MOSFET
ICs 1
IC1TL072TL072Dual op-amp, DIP8
Potentiometers 4
HIB500KB500k16mm right-angle PCB mount pot
LOB100KB100k16mm right-angle PCB mount pot
LEVELA100KA100k16mm right-angle PCB mount pot
DRIVEA500KA500k16mm right-angle PCB mount pot
Trimmers 2
BIAS11K1kTrimmer potentiometer, 3362P type
BIAS21K1kTrimmer potentiometer, 3362P type

Other boards based on the BK Butler Tube Driver