Enclosure not stated · 2 knobs
Runoffgroove PeppermillVerified
Based on the Run Off Groove Peppermill· 2 other boards clone it
From the post
Adding to the Runoffgroove library.
From ROG:
The idea behind this project is to create a natural sounding overdrive sound using minimal components. It should also be suitable for a booster for an already driven amp.
*snip*
Please take note of the transistor pin voltages shown below, specifically the source of the J201 JFET. It may be necessary to audition different J201 for the best sound. MPF102 and 2N3819 will not provide the desired sound in this circuit. Various J201 may have a range of source voltages, even when the drain voltage is set at 4.5 volts. Having a source voltage near 115mV should produce results that are very similar to the sound clips.
The LED serves as protection against potential damage to the MOSFET caused by static electricity (thanks to Joe Davisson for this idea). A 9.1v zener diode may be used as well (as seen in the Jack Orman's AMZ Mosfet Booster), with the same orientation. Jake Nagy's Blue Magic predates the Peppermill and exhibits a similar topology. However, the development of the Peppermill was not influenced by the Blue Magic design and any resemblance is coincidental.
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 18 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 1uF can at lower right is drawn pink rather than the usual white electrolytic: entered as electrolytic, could be meant as tantalum or non-polar
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×2 | 1K | 1k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 8.2K | 8.2k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 2.2nF | 2.2n | read from the layout by eye | |
| ×1 | 6.8nF | 6.8n | read from the layout by eye | |
| ×1 | 22nF | 22n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | BS170 | BS170 | MOSFET; BS170 or 2N7000; read from the layout by eye | |
| Q2 | J201 | J201 | JFET; read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | B250K | B250k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| VR1 | 50K | 50k | read from the layout by eye | |
| LEDs 1 | ||||
| D2 | 3mm red LED | 3MM RED LED | 3mm red LED (or 9V1 zener); read from the layout by eye | |
Other boards based on the Run Off Groove Peppermill
- Peppermill Aion FX · 125B · $12.50
- Run Off Groove Peppermill Effects Layouts (blog) · 1590A