Enclosure not stated · 3 knobs
BJF Dyna Red Distortion
Based on the BJFE Dyna Red Distortion· 1 other board clones it
- Category
- Overdrive
- Price
- see vendor
- Also as
- Perfboard layout · from Revolution Deux
- Tags
- freestompboxes.org trace
From the vendor
Bjorn Juhl's Dyna Red: a CA3130 op-amp gain stage with two red LEDs clipping in the feedback loop, a 1N4001 diode pair to ground after it, a treble control, and a 2N5458 JFET buffer before the volume. A 470p cap feeds the output back to the input stage to lower high-frequency gain. Smooth top end and a dynamic response.
The author suggests adding the bass control from Paul C's Timmy.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 40 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Fixes to the schematic, from the post
- The 0.47u cap in the op-amp's feedback/gain leg (in series with the 1K to ground) is drawn as 0.47u because the traced unit was modded by Bjorn for more lower-mid character; Soulsonic found that 0.1u restores the original sound.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 15 | ||||
| R1 | 1M | 1M | read from the schematic by eye | |
| R2 | 360K | 360k | read from the schematic by eye | |
| R3 | 15K | 15k | read from the schematic by eye | |
| R4 | 3K | 3k | read from the schematic by eye | |
| R5 | 6.8K | 6.8k | read from the schematic by eye | |
| R6 | 1K | 1k | read from the schematic by eye | |
| R7 | 1K | 1k | read from the schematic by eye | |
| R8 | 3K | 3k | read from the schematic by eye | |
| R9 | 1M | 1M | read from the schematic by eye | |
| R10 | 10K | 10k | read from the schematic by eye | |
| R11 | 4.7K | 4.7k | read from the schematic by eye | |
| R12 | 47 | 47 | read from the schematic by eye | |
| R13 | 47K | 47k | bias divider; read from the schematic by eye | |
| R14 | 47K | 47k | bias divider; read from the schematic by eye | |
| R15 | 3K | 3k | LED; read from the schematic by eye | |
| Capacitors 13 | ||||
| C1 | 22n | 22n | marked 223; read from the schematic by eye | |
| C2 | 100p | 100p | compensation, marked 101; read from the schematic by eye | |
| C3 | 100p | 100p | feedback, marked 101; read from the schematic by eye | |
| C4 | 10u | 10u | electrolytic, 16V; read from the schematic by eye | |
| C5 | 100n | 100n | drawn 0.47u/50V; the post says 0.1u restores the original sound; read from the schematic by eye | |
| C6 | 470p | 470p | marked 471; read from the schematic by eye | |
| C7 | 1u | 1u | electrolytic, 50V; read from the schematic by eye | |
| C8 | 47n | 47n | marked 473; read from the schematic by eye | |
| C9 | 22n | 22n | marked 223; read from the schematic by eye | |
| C10 | 22n | 22n | marked 223; read from the schematic by eye | |
| C11 | 1u | 1u | electrolytic, 50V; read from the schematic by eye | |
| C12 | 100u | 100u | electrolytic, 25V; read from the schematic by eye | |
| C13 | 22u | 22u | electrolytic, 25V; read from the schematic by eye | |
| Diodes 4 | ||||
| D1 | 1N4001 | 1N4001 | read from the schematic by eye | |
| D2 | 1N4001 | 1N4001 | read from the schematic by eye | |
| D3 | 1N4001 | 1N4001 | read from the schematic by eye | |
| D4 | 3.6V zener | 3V6 | in series with the LED; read from the schematic by eye | |
| Transistors 1 | ||||
| Q1 | 2N5458 | 2N5458 | read from the schematic by eye | |
| ICs 1 | ||||
| IC1 | CA3130EZ | CA3130EZ | read from the schematic by eye | |
| Potentiometers 3 | ||||
| Dist | A500K | A500k | Potentiometer | read from the schematic by eye |
| Treble | B50K | B50k | Potentiometer | read from the schematic by eye |
| Volume | B50K | B50k | Potentiometer | read from the schematic by eye |
| LEDs 3 | ||||
| LED1 | red | RED | 1.8V, feedback clipping; read from the schematic by eye | |
| LED2 | red | RED | 1.8V, feedback clipping; read from the schematic by eye | |
| LED3 | LED | LED | on/off indicator; read from the schematic by eye | |
Other boards based on the BJFE Dyna Red Distortion
- BJFE Dyna Red Distortion Tagboard Effects