Enclosure not stated · 2 knobs
ZVex Woolly Mammoth - Cut Down VersionVerified
Based on the Z.Vex Woolly Mammoth· 15 other boards clone it
From the post
Vince on here asked me if I could adapt my layout to make a 2 Knob Woolly Mammoth with just Pinch and Volume controls. He wanted me to remove the Wool pot simulating it being set fully clockwise, and remove the the EQ pot and simulate it being set dead centre.
The Wool pot was easy enough, it just takes the 100u cap from the emitter of Q3 to ground in the clockwise position, so I could connect that directly to ground. The EQ pot was 10K and so I used two 4K99 resistors from where lugs 1 and 3 of the EQ pot would have connected, and taking the other side of both resistors to the same row simulated the centre setting. If you want to alter this slightly just socket them and change the ratio between the two resistors, maybe try a 6K8 and 3K3 for instance if you want slightly more treble or swapped round for more bass.
I think it sounds great so I had to post it here just in case anyone else fancies making one too. Vince's excellent demo:
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 15 rows
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Check before you build · 2 values the reader of this layout was not sure of
- Off-board toggle between Input and Sw5: drawn as a blue 6-lug body with 220n and 22n across the outer lug pairs, no type or name printed; read as a DPDT on/on input-cap selector
- 4K99 (three of them): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×1 | 51K | 51k | read from the layout by eye | |
| ×1 | 20K | 20k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 2K2 | 2.2k | read from the layout by eye | |
| ×3 | 4K99 | 4.99k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| Capacitors 4 | ||||
| ×2 | 100u | 100u | electrolytic; read from the layout by eye | |
| ×2 | 10n | 10n | read from the layout by eye | |
| ×2 | 220n | 220n | one on the board, one on the input switch; read from the layout by eye | |
| ×1 | 22n | 22n | on the input switch; read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N3904 | 2N3904 | read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Pinch | B500K | B500k | Potentiometer | read from the layout by eye |
| Output | B10K | B10k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Input cap | DPDT on/on | DPDT ON/ON | toggle, unnamed in the drawing; selects 220n or 22n input cap; read from the layout by eye | |
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