1590A · 2 knobs
Bearhug FET CompressorVerified
Based on the Jon Patton Bearhug Compressor· 3 other boards clone it
- Category
- Compressor
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Compressor, Jon Patton
From the post
Here's a simple compressor design by Jon Patton (aka midwayfair) that's good for guitar and bass. In Jon's words:
The Bearhug is a tonally transparent, ultra-quiet, tiny, and easy-to-build compressor. It occupies some middle ground between the ultra-subtle compressors like the Flatline/Afterlife and Orange Squeezer and the super squishy compressors like the Ross.
For more info on the design, Jon goes into detail in this thread on DIYSB.
I built this one last night and it's everything Jon says it is. Very subtle, and a little bit of volume boost if you want it. Here's a few pics of my build.
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 24 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×3 | 100K | 100k | read from the layout by eye | |
| ×3 | 10M | 10M | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | starred: legend says 2.2-4.7k; read from the layout by eye | |
| ×1 | 2.7K | 2.7k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| ×2 | 1N4148 | 1N4148 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ×1 | 9.1V | 9V1 | zener, printed 9.1v; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | BS170 | BS170 | MOSFET; read from the layout by eye | |
| Q2 | High gain Si NPN | HIGH GAIN SI NPN | no part number given; read from the layout by eye | |
| Q3 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Potentiometers 2 | ||||
| Comp | C1K | C1k | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| High/Low | SPST | SPST | toggle; read from the layout by eye | |
Other boards based on the Jon Patton Bearhug Compressor
- Bear Hug Compressor 1776 Effects · $8.00
- Bearhug Compressor Fuzz Dog · 1590B · £31.20
- Bearhug FET Compressor Tagboard Effects