Clean Boost to Heavy Over-Drive

Features: - 4 channels with separate voicing and gain structure - Analog design - 10 dB clear boost - True bypass switching - Very low power consumption (~3mA) - No tone change, only enhances sound - Uses standard Boss 9v DC, negative-center power supply - Low noise

BOM:

Component Count: 36

Ref Value Part Description

C1: 100n Unpolarized capacitor
C2: 100n Unpolarized capacitor
C3: 22n Unpolarized capacitor
C4: 22n Unpolarized capacitor
C5: 22n Unpolarized capacitor
C6: 22n Unpolarized capacitor
C7: 100n Unpolarized capacitor
C8: 220u Capacitor_TTH Polarized capacitor

C9: 220u Capacitor_SMD Polarized capacitor

D1: 1N5817 Diode_TTH 20V 1A Schottky Diode, DO-41

D2: LED 5.0mm Light emitting diode

J1: Power Connector: 01x02

J2: Input_Output Connector: 01x04

J3: Output Select Connector: 01x03
J4: Source Switch Connector: 01x02

J5: Stomp Switch Connector

Q1: BF862 N-Ch JFET_TTH - or - Q10 BF862 N-Ch JFET_SMD

Q2: BF862 N-Ch JFET_TTH - or - Q20 BF862 N-Ch JFET_SMD

(Q1 & Q2 can be substituted with J201, 2N5457 and\or 2SK170)

R1: 1M Resistor_TTH
R2: 10k Resistor_TTH
R3: 1M Resistor_TTH
R4: 2k7 Resistor_TTH
R5: 10k Resistor_TTH
R6: 470k Resistor_TTH
R7: 220k Resistor_TTH
R8: 1M Resistor_TTH
R9: 1k Resistor_TTH
R10: 10k Resistor_TTH
R11: 1M Resistor_TTH
R12: 1M Resistor_TTH R13: 470 Resistor_TTH

VR1: A250k Potentiometer 9mm Rt Angle PC mount (Volume control)

VR2: 10k Trimmer Potentiometer_THT (Cermet 3362P) (VR2 is the Q2 bias adjust)

VR3: 20k TrimmerPotentiometer_THT (Cermet 3362P) (VR3 is the LED brightness control)