Enclosure not stated · 5 knobs
5-knob CompressorVerified
Based on the 5-knob Compressor
- Category
- Compressor
- Build
- Vero· 20×25· 32 cuts, 18 links
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- Compressor
From the post
Drew this one up some time ago and thought i'd post it up. It's basically Mark's layout for Keeley 4-knob style compressor with slight tweaks and more notably, an addition of mix/blend/ratio knob. As some of you already know, the basic CA3080 compressors like Ross, MXR and derivatives reverse the signal polarity and thus, the simple blend circuit additions won't work with it. So here's the Ross compressor with tons of usable mods on it. I've built a number of these already, so consider it verified.
2017/05/08 - One cap was reversed on the layout. Now fixed, but i had to redraw this completely due to lost source files. Anyway. Here's the "V2".
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 35 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| ×7 | 10K | 10k | read from the layout by eye | |
| ×5 | 15K | 15k | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 56K | 56k | marked 56K*: ~unity, higher value for boost; read from the layout by eye | |
| ×4 | 100K | 100k | read from the layout by eye | |
| ×1 | 130K | 130k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×4 | 1M | 1M | read from the layout by eye | |
| ×1 | 4.7M | 4.7M | read from the layout by eye | |
| Capacitors 12 | ||||
| ×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 | |
| ×5 | 10nF | 10n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 470nF | 470n | read from the layout by eye | |
| ×1 | 1uF | 1u | film; read from the layout by eye | |
| ×6 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | D1, D2; read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| ×5 | 2N3904 | 2N3904 | All transistors 2N3904 (or similar); read from the layout by eye | |
| ICs 2 | ||||
| IC1 | CA3080 | CA3080 | read from the layout by eye | |
| IC2 | TL072 | TL072 | TL072 (or similar); read from the layout by eye | |
| Potentiometers 5 | ||||
| Comp | C500K | C500k | Potentiometer | read from the layout by eye |
| Attack | B100K | B100k | Potentiometer | read from the layout by eye |
| Clip | B100K | B100k | Potentiometer | read from the layout by eye |
| Blend | B10K | B10k | Potentiometer | read from the layout by eye |
| Output | B50K | B50k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×1 | 2K | 2k | read from the layout by eye | |