125B · 6 knobs
From the vendor
Controls
• Volume
• Gain
• Treble
• Mid
• Bass
• Presence
Details
• Designed for a 125B enclosure with top-mounted jacks
The company, product and service names used in this web site are for identification purposes only. All trademarks and registered trademarks are the property of their respective owners. This product is not manufactured or distributed by Mesa Engineering, maker of the MESA/Boogie Amplifier.
PedalPCB is not affiliated with Mesa Engineering.
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 58 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 21 | ||||
| R1 | 2M2 | 2.2M | Resistor, 1/4W | |
| R2 | 680K | 680k | Resistor, 1/4W | |
| R3 | 68K | 68k | Resistor, 1/4W | |
| R4 | 1K8 | 1.8k | Resistor, 1/4W | |
| R5 | 2M2 | 2.2M | Resistor, 1/4W | |
| R6 | 680K | 680k | Resistor, 1/4W | |
| R7 | 680K | 680k | Resistor, 1/4W | |
| R8 | 1K8 | 1.8k | Resistor, 1/4W | |
| R9 | 470K | 470k | Resistor, 1/4W | |
| R10 | 1M | 1M | Resistor, 1/4W | |
| R11 | 3K9 | 3.9k | Resistor, 1/4W | |
| R12 | 330K | 330k | Resistor, 1/4W | |
| R13 | 220K | 220k | Resistor, 1/4W | |
| R14 | 1K8 | 1.8k | Resistor, 1/4W | |
| R15 | 10K | 10k | Resistor, 1/4W | |
| R16 | 10K | 10k | Resistor, 1/4W | |
| R17 | 2K2 | 2.2k | Resistor, 1/4W | |
| R20 | 5K1 | 5.1k | Resistor, 1/4W | |
| R100 | 4K7 | 4.7k | Resistor, 1/4W | * LED current limiting resistor |
| R101 | 100R | 100 | Resistor, 1/4W | |
| R102 | 100R | 100 | Resistor, 1/4W | |
| Capacitors 21 | ||||
| C1 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 220p | 220p | Ceramic capacitor | |
| C3 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C4 | 1u | 1u | Electrolytic capacitor, 5mm | |
| C5 | 2n2 | 2.2n | Film capacitor, 7.2 x 2.5mm | |
| C6 | 1n | 1n | Film capacitor, 7.2 x 2.5mm | |
| C7 | 22p | 22p | Ceramic capacitor | |
| C8 | 220p | 220p | Ceramic capacitor | |
| C9 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C10 | 1u | 1u | Electrolytic capacitor, 5mm | |
| C11 | 1n | 1n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 22n | 22n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 220p | 220p | Ceramic capacitor | |
| C14 | 1u | 1u | Electrolytic capacitor, 5mm | |
| C15 | 220n | 220n | Film capacitor, 7.2 x 5.0mm | |
| C16 | 6n8 | 6.8n | Film capacitor, 7.2 x 2.5mm | |
| C17 | 220n | 220n | Film capacitor, 7.2 x 5.0mm | |
| C18 | 33n | 33n | Film capacitor, 7.2 x 2.5mm | |
| C100 | 100u | 100u | Electrolytic capacitor, 5mm | |
| C101 | 100u | 100u | Electrolytic capacitor, 5mm | |
| C102 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| Diodes 1 | ||||
| D100 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| Transistors 5 | ||||
| Q1 | J201 | J201 | JFET transistor, N-channel | |
| Q2 | J201 | J201 | JFET transistor, N-channel | |
| Q3 | J201 | J201 | JFET transistor, N-channel | |
| Q4 | J201 | J201 | JFET transistor, N-channel | |
| Q5 | J201 | J201 | JFET transistor, N-channel | |
| Potentiometers 6 | ||||
| VOLUME | A100K | A100k | 16mm right-angle PCB mount pot | |
| PRES | B10K | B10k | 16mm right-angle PCB mount pot | |
| GAIN | A1M | A1M | 16mm right-angle PCB mount pot | |
| TREBLE | A25K | A25k | 16mm right-angle PCB mount pot | |
| MID | B5K | B5k | 16mm right-angle PCB mount pot | |
| BASS | A100K | A100k | 16mm right-angle PCB mount pot | |
| Trimmers 4 | ||||
| TRIM1 | 100K | 100k | Trimmer potentiometer, 3362P type | |
| TRIM2 | 100K | 100k | Trimmer potentiometer, 3362P type | |
| TRIM3 | 100K | 100k | Trimmer potentiometer, 3362P type | |
| TRIM4 | 100K | 100k | Trimmer potentiometer, 3362P type | |
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