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    SOBPreamp PedalPCB

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    © All Rights Reserved
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    SOBPreamp PedalPCB

    Uploaded by

    UPSIDE-DOWN
    4 views6 pages

    Original Title

    SOBPreamp-PedalPCB (1)

    Copyright

    © © All Rights Reserved

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    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    4 views6 pages

    SOBPreamp PedalPCB

    Uploaded by

    UPSIDE-DOWN

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 6

    Son of Ben Preamp

    Revised 10/26/21

    CONTROLS AND FEATURES


    • Volume
    • Drive
    • Treble
    • Bass

    All trademarks and registered trademarks are the property of their respective owners. The company, product, and service names used in this web site
    are for identification purposes only. Use of these names, logos, and brands does not imply endorsement.

    Son of Ben Preamp Copyright © 2020 - PedalPCB.com Page 1 of 6


    Son of Ben Preamp
    Parts List (Page 1 of 1)

    LOCATION VALUE TYPE NOTES


    R1 1M Resistor, 1/4W
    R2 220K Resistor, 1/4W
    R3 1M Resistor, 1/4W
    R4 1K Resistor, 1/4W
    R5 10K Resistor, 1/4W
    R6 470K Resistor, 1/4W
    R7 470K Resistor, 1/4W
    R8 1K Resistor, 1/4W
    R9 10K Resistor, 1/4W
    R10 100K Resistor, 1/4W
    R11 1K Resistor, 1/4W
    R12 10K Resistor, 1/4W
    R13 47K Resistor, 1/4W
    R100 4K7 Resistor, 1/4W

    C1 100n Film capacitor, 7.2 x 2.5mm


    C2 22n Film capacitor, 7.2 x 2.5mm
    C3 250p Ceramic capacitor
    C4 470p Ceramic capacitor
    C5 10u Electrolytic capacitor, 5mm
    C6 22n Film capacitor, 7.2 x 2.5mm
    C7 22n Film capacitor, 7.2 x 2.5mm
    C8 22n Film capacitor, 7.2 x 2.5mm
    C9 2n2 Film capacitor, 7.2 x 2.5mm
    C10 10u Electrolytic capacitor, 5mm *Optional (see Page 3)
    C100 100u Electrolytic capacitor, 5mm
    C101 100n Film capacitor, 7.2 x 2.5mm

    D100 1N5817 Schottky diode, DO-41

    Q1 J201 JFET transistor, N-channel *Alternate MMBFJ201 (SMD)


    Q2 J201 JFET transistor, N-channel *Alternate MMBFJ201 (SMD)
    Q3 J201 JFET transistor, N-channel *Alternate MMBFJ201 (SMD)

    VOLUME A100K 16mm right-angle PCB mount pot


    DRIVE A1M 16mm right-angle PCB mount pot
    TREBLE A250K 16mm right-angle PCB mount pot
    BASS *** *** * Refer to Page 3

    TRIM1 50K Trim potentiometer 3362P-style


    TRIM2 50K Trim potentiometer 3362P-style
    TRIM3 50K Trim potentiometer 3362P-style

    NOTE
    C10 was only populated in the first 100 units.
    Newer units omit this capacitor.

    Son of Ben Preamp Copyright © 2020 - PedalPCB.com Page 2 of 6


    Son of Ben Preamp
    Additional Information

    Bass Potentiometer
    The original B2M Single-Ganged potentiometer used for the Bass control isn’t a common value and
    can be difficult to source. Alternatively a B1M Dual-Ganged potentiometer can be used.

    The Son of Ben Preamp PCB layout is designed to accommodate either part.

    B2M Single-Ganged B1M Dual-Ganged

    When using a Single-Ganged B2M When using a Dual-Ganged B1M


    potentiometer the solder pads between potentiometer the solder pads between
    lugs 2 and 3 of the Bass potentiometer lugs 2 and 3 of the Bass potentiometer
    should be bridged with solder. should be left open.

    The potentiometer should be installed


    into the bottom row of pads.

    Capacitor C10 (Optional)


    Capacitor C10 was only populated in the first 100 original units. Current production units
    omit this capacitor.

    Son of Ben Preamp Copyright © 2020 - PedalPCB.com Page 3 of 6


    Son of Ben Preamp
    Schematic Diagram

    Son of Ben Preamp


    Copyright © 2020 - PedalPCB.com
    Adjust TRIM1 to 2KΩ
    Adjust TRIM2 for 4.0V on Drain of Q2
    Adjust TRIM3 for 4.0V on Drain of Q3

    Page 4 of 6
    Son of Ben Preamp
    Wiring Diagram

    Son of Ben Preamp Copyright © 2020 - PedalPCB.com Page 5 of 6


    Son of Ben Preamp
    Drill Template
    125B Enclosure

    O UT
    CK

    IN
    K
    P

    C
    A
    PU UT JA
    TJ

    D
    K
    C J C
    A

    IO M IO M
    NT NT
    ET

    ET
    POTE

    POTE
    ER

    ER
    Volume LED
    Drive

    IO M IO M
    NT NT
    ET

    ET
    POTE

    POTE
    ER

    ER

    Treble Bass

    S WIT
    OT C
    FO

    Son of Ben Preamp Copyright © 2020 - PedalPCB.com Page 6 of 6

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