Enclosure not stated · 3 knobs
Mad Professor Forest Green Compressor
Based on the Mad Professor Forest Green Compressor· 2 other boards clone it
- Category
- Compressor
- Controls
- Tone · Compression · Volume
- Build
- Perfboard
- Layout
- Unverified · no build reported at Effects Layouts (blog) yet
- Tags
- Compressor, Mad Professor
From the post
Got a request for this one. It's very similar to Bjorn's Pale Green Compressor in his BearFoot Fx line, but with an extra stage for the Sustain mode. Here's the schematic for reference. From the product description:
FOREST GREEN COMPRESSOR (FGC) is designed to meet the highest standards of guitar and bass compression. There is extremely low noise throughout the range and a high overload margin, which allows also a wide dynamic input range at minimum distortion and noise. FGC is equipped with a special tone control to fine-tune the compressed sound for most transparent tone and effect. The pedal has a switchable compressor and sustainer mode. In Sustain mode you can get a very dynamic, touch sensitive tone with a long sustain. Here the attack is not lost, making the pedal suit-able even for blues players and works great with slide playing.
I've made 2 versions of the layout, one with SGD pinout for the 2SK170, and another with the more common GSD pinout for other JFETs (J201, 2N5457, etc)
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 39 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
- 147K (x3), 16.9K, 285Ω, 110Ω (x2), 2.4K, 130K: printed clearly, unusual values (they match the schematic)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 17 | ||||
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | 2M | 2M | read from the layout by eye | |
| ×1 | 16.9K | 16.9k | read from the layout by eye | |
| ×1 | 130K | 130k | read from the layout by eye | |
| ×3 | 147K | 147k | read from the layout by eye | |
| ×1 | 56K | 56k | read from the layout by eye | |
| ×1 | 2.4K | 2.4k | read from the layout by eye | |
| ×3 | 5.6K | 5.6k | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×2 | 27K | 27k | read from the layout by eye | |
| ×2 | 47K | 47k | read from the layout by eye | |
| ×1 | 285Ω | 285 | read from the layout by eye | |
| ×2 | 110Ω | 110 | read from the layout by eye | |
| ×2 | 200K | 200k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×3 | 100nF | 100n | read from the layout by eye | |
| ×2 | 220nF | 220n | read from the layout by eye | |
| ×4 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×5 | 22uF | 22u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×1 | 1N4007 | 1N4007 | read from the layout by eye | |
| ×2 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 5 | ||||
| Q1 | 2SK170 | 2SK170 | JFET; read from the layout by eye | |
| Q2 | BC560C | BC560C | read from the layout by eye | |
| Q3 | BC550C | BC550C | read from the layout by eye | |
| Q4 | BC550C | BC550C | read from the layout by eye | |
| Q5 | BC550C | BC550C | read from the layout by eye | |
| ICs 2 | ||||
| ×1 | AD797 | AD797 | read from the layout by eye | |
| ×1 | 78L05 | 78L05 | regulator; read from the layout by eye | |
| Opto 1 | ||||
| ×1 | LDR | LDR | no type given; read from the layout by eye | |
| Potentiometers 3 | ||||
| Tone | A20K | A20k | Potentiometer | read from the layout by eye |
| Compression | A500K | A500k | Potentiometer | read from the layout by eye |
| Volume | B50K | B50k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Sustain | SPST | SPST | read from the layout by eye | |
| LEDs 1 | ||||
| ×1 | LED | LED | on the board, drawn red; no type given; read from the layout by eye | |
Other boards based on the Mad Professor Forest Green Compressor
- Mad Professor Forest Green Compressor Revolution Deux
- Mad Professor Forest Green Compressor Tagboard Effects · 1590B