Enclosure not stated · 4 knobs
Keeley 4-Knob CompressorVerified
Based on the Keeley 4-Knob Compressor· 2 other boards clone it
- Category
- Compressor
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Compressor, Keeley
From the post
The Keeley 4-Knob Compressor is a modified Ross Compressor and is highly regarded in the stompbox world. It's only down side is the use of the obsolete CA3080 chip. These can be hard to find and a little pricy. However if you're unable to find one, or unwilling to pay for one, use the LM13700 chip (which is 2 3080s in one) and this conversion daughter board. The schematic can be found here. If you have a hard time getting 150k pots, use a 250k pot with a 390k resistor in parallel (between lugs 1 and 3).
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 32 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 1 value the reader of this layout was not sure of
- 1uF at rows G-I, left of the 10uF: drawn as a grey rounded box rather than a round can, taken as a film/box cap; the other four 1uF are round cans
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×1 | 4.7M | 4.7M | read from the layout by eye | |
| ×7 | 10K | 10k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×2 | 1K | 1k | read from the layout by eye | |
| ×4 | 1M | 1M | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| Capacitors 10 | ||||
| ×1 | 150pF | 150p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×4 | 10nF | 10n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 1uF | 1u | box film; read from the layout by eye | |
| ×4 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| ×2 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q3 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q4 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q5 | 2N3904 | 2N3904 | read from the layout by eye | |
| ICs 1 | ||||
| ×1 | CA3080 | CA3080 | read from the layout by eye | |
| Potentiometers 4 | ||||
| Clip | B150K | B150k | Potentiometer | read from the layout by eye |
| Attack | B150K | B150k | Potentiometer | read from the layout by eye |
| Sustain | C500K | C500k | Potentiometer | read from the layout by eye |
| Level | B50K | B50k | Potentiometer | read from the layout by eye |
Other boards based on the Keeley 4-Knob Compressor
- 401K Compressor PedalPCB · 125B · $12.00
- Keeley 4-Knob Compressor Tagboard Effects