125B · 5 knobs
From the vendor
Controls
• Volume
• Gain
• Bass
• Treble
• Boost
Footswitches
• Active/Bypass
• Boost
Details
• Designed for a 125B enclosure with top-mounted jacks
Schematic
The schematic is in the vendor's build document, page 4. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 55 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 23 | ||||
| R1 | 2M2 | 2.2M | Resistor, 1/4W | |
| R2 | 10K | 10k | Resistor, 1/4W | |
| R3 | 2M2 | 2.2M | Resistor, 1/4W | |
| R4 | 47K | 47k | Resistor, 1/4W | |
| R5 | 470K | 470k | Resistor, 1/4W | |
| R6 | 47R | 47 | Resistor, 1/4W | |
| R7 | 680K | 680k | Resistor, 1/4W | |
| R8 | 15K | 15k | Resistor, 1/4W | |
| R9 | 1K | 1k | Resistor, 1/4W | |
| R10 | 1K | 1k | Resistor, 1/4W | |
| R11 | 1K | 1k | Resistor, 1/4W | |
| R12 | 39K | 39k | Resistor, 1/4W | |
| R13 | 10K | 10k | Resistor, 1/4W | |
| R14 | 150K | 150k | Resistor, 1/4W | |
| R15 | 470K | 470k | Resistor, 1/4W | |
| R16 | 3K3 | 3.3k | Resistor, 1/4W | |
| R17 | 10K | 10k | Resistor, 1/4W | |
| R18 | 2K2 | 2.2k | Resistor, 1/4W | |
| R19 | 47K | 47k | Resistor, 1/4W | |
| R100 | 4K7 | 4.7k | Resistor, 1/4W | |
| R101 | 4K7 | 4.7k | Resistor, 1/4W | |
| R102 | 100K | 100k | Resistor, 1/4W | |
| R103 | 100K | 100k | Resistor, 1/4W | |
| Capacitors 17 | ||||
| C1 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 47p | 47p | Ceramic capacitor | |
| C3 | 1u | 1u | Film capacitor, 7.2 x 5.0mm | |
| C4 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C5 | 100p | 100p | Ceramic capacitor | |
| C6 | 220n | 220n | Film capacitor, 7.2 x 5.0mm | |
| C7 | 4u7 | 4.7u | Electrolytic capacitor, 5mm | |
| C8 | 1u | 1u | Film capacitor, 7.2 x 5.0mm | |
| C9 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C10 | 4n7 | 4.7n | Film capacitor, 7.2 x 2.5mm | |
| C11 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 1u | 1u | Film capacitor, 7.2 x 5.0mm | |
| C14 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C15 | 470p | 470p | Ceramic capacitor | |
| C100 | 100u | 100u | Electrolytic capacitor, 5mm | |
| C101 | 10u | 10u | Electrolytic capacitor, 5mm | |
| Diodes 7 | ||||
| D1 | 1N4148 | 1N4148 | Signal diode, DO-35 | |
| D2 | 1N4004 | 1N4004 | Rectifier diode, DO-41 | |
| D3 | 1N4004 | 1N4004 | Rectifier diode, DO-41 | |
| D4 | 1N4148 | 1N4148 | Signal diode, DO-35 | |
| D5 | BA482 | BA482 | Band-switching diode, DO-34 | |
| D6 | BA482 | BA482 | Band-switching diode, DO-34 | |
| D100 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| Transistors 2 | ||||
| Q1 | MPF4393 | MPF4393 | JFET transistor, N-channel | |
| Q2 | MPF4393 | MPF4393 | JFET transistor, N-channel | |
| ICs 1 | ||||
| IC1 | CA3130EZ | CA3130EZ | Single op-amp (MOSFET), DIP8 | ) |
| Potentiometers 5 | ||||
| VOLUME | A50K | A50k | 16mm right-angle PCB mount pot | |
| GAIN | A250K | A250k | 16mm right-angle PCB mount pot | |
| BASS | C10K | C10k | 16mm right-angle PCB mount pot | |
| TREBLE | W20K | W20k | 16mm right-angle PCB mount pot | |
| BOOST | C50K | C50k | 16mm right-angle PCB mount pot | |