Enclosure not stated · 1 knob
Soulsonic Crackle Not OKVerified
Based on the SoulSonic FX Crackle Not OK· 2 other boards clone it
From the post
Requested compact layout as an alternative to the compact SHO.
Martin wrote when sharing the original schematic at Freestompboxes:
Alright, I got it finally figured out... an SHO-style MOSFET boost with NO CRACKLE!!!
I came up with a new gain control for it that allows for the same range of gain adjustment without having to adjust the Source. Since the Source stays fixed, there is no crackling.
While thinking about how to solve this problem, I realized I could treat the basic gain stage as an inverting opamp. So, I set a fixed max gain and tried a variable resistance in series with the input and voila, works perfectly.
Check it out and give it a try; it's a great improvement over the SHO and it's easy to tweak the sound to taste.
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 10 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 4 | ||||
| ×2 | 2M2 | 2.2M | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 5K1 | 5.1k | read from the layout by eye | |
| Capacitors 3 | ||||
| ×1 | 150n | 150n | read from the layout by eye | |
| ×1 | 47u | 47u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | 1N5242B | 1N5242B / 12V | 12V zener; read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | BS170 | BS170 | MOSFET; read from the layout by eye | |
| Potentiometers 1 | ||||
| Gain | C1M | C1M | Potentiometer | read from the layout by eye |
Other boards based on the SoulSonic FX Crackle Not OK
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- Crackle Not OK Tagboard Effects