Enclosure not stated · 2 knobs
Simple Transistor CompressorVerified
Based on the Simple Transistor Compressor
- Category
- Compressor
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Compressor, MicTester
From the post
FSB member Mictester came up with this design a couple years ago. Utilizes 4 transistors, 1 PNP and 3 NPN, though you could probably use an NPN in place of the PNP. Best to socket and try a few different transistors. The schematic says BC213L for Q1 and BC183L for Q2-4, but any medium gain transistors should work okay (2N2222, 2N2907, 2N3904, 2N3906). I added some of the mods suggested in the FSB thread for higher input impedance and noise reduction.
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 18 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×3 | 1M | 1M | read from the layout by eye | |
| ×3 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| Capacitors 3 | ||||
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×4 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | PNP silicon | PNP SILICON | no part number given; read from the layout by eye | |
| Q2 | NPN silicon | NPN SILICON | no part number given; read from the layout by eye | |
| Q3 | NPN silicon | NPN SILICON | no part number given; read from the layout by eye | |
| Q4 | NPN silicon | NPN SILICON | no part number given; read from the layout by eye | |
| Potentiometers 2 | ||||
| Ratio | B100K | B100k | Potentiometer | read from the layout by eye |
| Level | A10K | A10k | Potentiometer | read from the layout by eye |