Enclosure not stated · 2 knobs
Runoffgroove Big DaddyVerified
Based on the Run Off Groove Big Daddy· 3 other boards clone it
- Category
- Distortion
- Build
- Vero· 13×8· 9 cuts, 4 links
- Layout
- Verified · Tagboard Effects marks it as built and working
- Tags
- Distortion, Overdrive, Runoffgroove
From the post
Continuing Grace Overdrive article at ROG: During the testing of this circuit design (meaning the Grace Overdrive), the thought occurred to try a Jfet gain stage before the 386, instead of the buffer. The impedance would still be high and the 386 would see more signal and clip harder. The result is a pleasing grind and responsive big amp-like distortion. The gain control functions in the same way, but the range is higher in gain. Pretty effective, considering that if you want to use a gain stage, you probably don't want the semi-clean settings of the buffered version.
So here's the Big Daddy. Basically, Grace with a gain stage instead of buffer at the input.
And a little clip with gain maxed:
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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 13 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 4 | ||||
| ×1 | 4.7M | 4.7M | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 4 | ||||
| ×1 | 6.8nF | 6.8n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D1 | ? | ? | value not given; read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | J201 | J201 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | LM386 | LM386 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Drive | B1K | B1k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
Other boards based on the Run Off Groove Big Daddy
- Run Off Groove Big Daddy/Grace Effects Layouts (blog) · 1590A
- FuzzPup Daddy Grace Drive/Distortion Fuzz Dog · 1590A · £21.60
- Runoffgroove "Big Grace" Tagboard Effects