125B · 5 knobs
PedalPCB· PCB159
Obsidius Preamp
Based on the Darkglass Microtubes B3K· 7 other boards clone it
- Category
- Preamp / Amp-in-a-box· Preamps
- Controls
- Level · Drive · Blend · Attack (Toggle Switch) · Grunt (Toggle Switch)
- Price
- $12.00in stock
- Tags
- 125B
From the vendor
Controls
• Level – Controls the overall output volume
• Drive – Controls amount of signal gain
• Blend – Controls the blend of clean / overdriven signal
• Attack (Toggle Switch) – Sets the amount of treble content (Cut / Flat / Boost)
• Grunt (Toggle Switch) – Sets the amount of pre-clipping low end content (Raw / Thin / Fat)
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 Darkglass Electronics, maker of the Microtubes B3K.
PedalPCB is not affiliated with Darkglass Electronics.
Schematic
The schematic is in the vendor's build document. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 66 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 32 | ||||
| R1 | 1M | 1M | ||
| R2 | 1M | 1M | ||
| R3 | 10K | 10k | ||
| R4 | 100K | 100k | ||
| R5 | 1M | 1M | ||
| R6 | 3K3 | 3.3k | ||
| R7 | 1M | 1M | ||
| R8 | 1M | 1M | ||
| R9 | 200K | 200k | ||
| R10 | 6K8 | 6.8k | ||
| R11 | 22K | 22k | ||
| R12 | 470K | 470k | ||
| R13 | 470K | 470k | ||
| R14 | 1M | 1M | ||
| R15 | 330K | 330k | ||
| R16 | 3K3 | 3.3k | ||
| R17 | 6K8 | 6.8k | ||
| R18 | 470K | 470k | ||
| R19 | 10K | 10k | ||
| R20 | 1M | 1M | ||
| R21 | 100K | 100k | ||
| R22 | 33K | 33k | ||
| R23 | 10K | 10k | ||
| R24 | 22K | 22k | ||
| R25 | 22K | 22k | ||
| R26 | 47K | 47k | ||
| R27 | 1K | 1k | ||
| R28 | 100K | 100k | ||
| R29 | 100R | 100 | ||
| R100 | 4K7 | 4.7k | ||
| R101 | 10K | 10k | ||
| R102 | 10K | 10k | ||
| Capacitors 25 | ||||
| C1 | 100n | 100n | ||
| C2 | 1n | 1n | ||
| C3 | 220n | 220n | ||
| C4 | 22n | 22n | ||
| C5 | 22n | 22n | ||
| C6 | 22n | 22n | ||
| C7 | 22n | 22n | ||
| C8 | 220p | 220p | ||
| C9 | 100n | 100n | ||
| C10 | 22p | 22p | ||
| C11 | 4n7 | 4.7n | ||
| C12 | 22n | 22n | ||
| C13 | 220n | 220n | ||
| C14 | 22p | 22p | ||
| C15 | 1u | 1u | ||
| C16 | 680p | 680p | ||
| C17 | 22n | 22n | ||
| C18 | 2n2 | 2.2n | ||
| C19 | 2n2 | 2.2n | ||
| C20 | 2n2 | 2.2n | ||
| C21 | 1n | 1n | ||
| C22 | 1u | 1u | ||
| C23 | 220n | 220n | ||
| C100 | 100u | 100u | ||
| C101 | 100u | 100u | ||
| Diodes 3 | ||||
| D1 | 1N4148 | 1N4148 | ||
| D2 | 1N4148 | 1N4148 | ||
| D100 | 1N5817 | 1N5817 | ||
| Transistors 2 | ||||
| Q1 | J201 | J201 | ||
| Q2 | J201 | J201 | ||
| ICs 4 | ||||
| IC1 | TL072 | TL072 | ||
| IC2 | CD4049UBE | CD4049UBE | ||
| IC3 | TL072 | TL072 | ||
| IC4 | TL072 | TL072 | ||
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