125B · 5 knobs
From the vendor
Controls
• Level
• Bias
• Gain
• Bass
• Treble
Details
• Designed for a 125B enclosure with top-mounted jacks
Schematic
The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 59 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 29 | ||||
| R1 | 10 | 10 | ||
| R3 | 100k | 100k | ||
| R4 | 100k | 100k | ||
| R8 | 100k | 100k | ||
| R22 | 100k | 100k | ||
| R5 | 6k8 | 6.8k | ||
| R6 | 330 | 330 | ||
| R7 | 1M | 1M | ||
| R17 | 1M | 1M | ||
| R9 | 680k | 680k | ||
| R10 | 150k | 150k | ||
| R11 | 220 | 220 | ||
| R12 | 10k | 10k | ||
| R25 | 10k | 10k | ||
| R28 | 10k | 10k | ||
| R29 | 10k | 10k | ||
| R13 | 22k | 22k | ||
| R15 | 22k | 22k | ||
| R18 | 22k | 22k | ||
| R14 | 470k | 470k | ||
| R19 | 470k | 470k | ||
| R30 | 470k | 470k | ||
| R16 | 27k | 27k | ||
| R20 | 43k | 43k | ||
| R21 | 4k7 | 4.7k | ||
| R23 | 4k7 | 4.7k | ||
| R24 | 5k6 | 5.6k | ||
| R26 | 56k | 56k | ||
| R27 | 1k | 1k | ||
| Capacitors 20 | ||||
| C1 | 100u | 100u | ||
| C3 | 100u | 100u | ||
| C2 | 22u | 22u | ||
| C4 | 150n | 150n | ||
| C9 | 150n | 150n | ||
| C24 | 150n | 150n | ||
| C6 | 68p | 68p | ||
| C7 | 6n8 | 6.8n | ||
| C12 | 6n8 | 6.8n | ||
| C8 | 47p | 47p | ||
| C11 | 47p | 47p | ||
| C13 | 47p | 47p | ||
| C14 | 56n | 56n | ||
| C16 | 4n7 | 4.7n | ||
| C17 | 68n | 68n | ||
| C18 | 100p | 100p | ||
| C19 | 39n | 39n | ||
| C21 | 1n5 | 1.5n | ||
| C22 | 1n | 1n | ||
| C23 | 2n2 | 2.2n | ||
| Diodes 1 | ||||
| D1 | 1N5817 | 1N5817 | ||
| Transistors 1 | ||||
| Q1 | BC549C | BC549C | High gain NPN Si. Check the pinout. | |
| ICs 2 | ||||
| IC1 | CD4007 | CD4007 | ||
| IC2 | TL072 | TL072 | ||
| Potentiometers 5 | ||||
| POT1 | A250k | A250k | ||
| POT2 | B100k | B100k | ||
| POT3 | C10k | C10k | ||
| POT5 | B500k | B500k | ||
| POT6 | B50k | B50k | ||
| LEDs 1 | ||||
| D2 | LED | LED | ||