1590B · 3 knobs
Pigtronix Fat DriveVerified
Based on the Pigtronix Fat Drive· 4 other boards clone it
From the post
Here's an interesting one from Pigtronix. It uses a TL072 to push a CD4049, which is followed by another TL072 pushing a Rat-esque tone control. All the gain stages make for natural compression and tube-like tone without using clipping diodes. Schematic for reference on FSB here (note, I've linked the inputs of the unused stages of the CD4049 to +9v to avoid any unwanted noise). Runs great on 9 or 18 volts and will fit in a 1590B with board mounted pots.
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 31 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×1 | 62K | 62k | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 470Ω | 470 | read from the layout by eye | |
| ×1 | 1.6K | 1.6k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×4 | 100K | 100k | read from the layout by eye | |
| ×1 | 680K | 680k | read from the layout by eye | |
| ×4 | 130K | 130k | read from the layout by eye | |
| ×1 | 10M | 10M | read from the layout by eye | |
| ×2 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 560K | 560k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | LED resistor; read from the layout by eye | |
| ×1 | 150Ω | 150 | read from the layout by eye | |
| Capacitors 9 | ||||
| ×2 | 100pF | 100p | read from the layout by eye | |
| ×1 | 82nF | 82n | read from the layout by eye | |
| ×2 | 27nF | 27n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 220nF | 220n | read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | printed as 4148; read from the layout by eye | |
| ×1 | 1N5817 | 1N5817 | printed as 5817; read from the layout by eye | |
| ICs 2 | ||||
| ×2 | TL072 | TL072 | read from the layout by eye | |
| ×1 | CD4049UB | CD4049UB | read from the layout by eye | |
| Potentiometers 3 | ||||
| Gain | B1M | B1M | Potentiometer | printed 1M Lin; read from the layout by eye |
| Tone | B10K | B10k | Potentiometer | printed 10K Lin; read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | printed 100K Log; read from the layout by eye |
| Switches 1 | ||||
| Hi/Lo | SPST | SPST | read from the layout by eye | |
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