1590B · 2 knobs
JMK PCBs· 011
Engineer's Thumb Compressor
Based on the Valve Wizard Engineer's Thumb· 8 other boards clone it
- Category
- Compressor
- Difficulty
- Easy
- Price
- $12.00in stock
- Tags
- limited-edition
From the vendor
The Engineer’s Thumb is a unique compressor that picks up the classic OTA type of compressor and gives it some modern adjustment. Most notably, it’s has a much quieter noise floor, and it’s also less coloured than the classic Ross/Dyna type of compressor. This compressor is great to use with Acoustic, Electric and Bass guitars.
(Rev 1.0)
(Rev 1.2)
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 32 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 15 | ||||
| R1 | 1K | 1k | ||
| R9 | 1M | 1M | ||
| R2 | 10M | 10M | ||
| R10 | 10K | 10k | ||
| R3 | 1M | 1M | ||
| R11 | 10K | 10k | ||
| R4 | 1M | 1M | ||
| R12 | 220R | 220 | ||
| R5 | 100R | 100 | ||
| R13 | 1K | 1k | ||
| R6 | 1K | 1k | ||
| R14 | 1M | 1M | ||
| R7 | 1K | 1k | ||
| R15 | 1M | 1M | ||
| R8 | 1K | 1k | ||
| Capacitors 6 | ||||
| C1 | 10nF | 10n | ||
| C5 | 1uF | 1u | ||
| C2 | 100pF | 100p | ||
| C6 | 1uF | 1u | ||
| C3 | 1uF | 1u | ||
| C7 | 100nF | 100n | ||
| Diodes 4 | ||||
| D1 | 1N4148 | 1N4148 | ||
| D4 | 1N4148 | 1N4148 | ||
| D5 | 1N4148 | 1N4148 | ||
| D6 | 1N4001 | 1N4001 | ||
| Transistors 1 | ||||
| Q1 | 2N3906 | 2N3906 | ||
| ICs 2 | ||||
| IC1 | TL074 | TL074 | ||
| IC2 | CA3080 | CA3080 | ||
| Potentiometers 2 | ||||
| LEVEL | A10K | A10k | Potentiometer | |
| RATIO | A1M | A1M | Potentiometer | |
| LEDs 2 | ||||
| D2 | Red LED | RED LED | ||
| D3 | Red LED | RED LED | ||
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