Enclosure not stated · 2 knobs
HAO Sole PressureVerified
Based on the HAO Sole Pressure· 3 other boards clone it
From the post
Here's HAO's take on the Distortion +/250 Preamp circuit. It uses LED clipping and features a Brilliance switch for normal, bright, and warm settings. A TL072 dual opamp is used, but on the original, only one side is used and the other is left unconnected. In this layout, I used the unused opamp for the voltage divider to give more stability there.
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 19 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×2 | 22K | 22k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 68pF | 68p | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 470nF | 470n | read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | printed 4001; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | TL072 | TL072 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Drive | C500K | C500k | Potentiometer | printed 500K Rev log; read from the layout by eye |
| Volume | B100K | B100k | Potentiometer | printed 100K Lin; read from the layout by eye |
| Switches 1 | ||||
| Switch | SPDT on/off/on | SPDT ON/OFF/ON | toggle, pads Sw1-Sw3; read from the layout by eye | |
| LEDs 2 | ||||
| D1 | red LED | RED LED | read from the layout by eye | |
| D2 | red LED | RED LED | read from the layout by eye | |
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