1590B · 3 knobs
EarthQuaker Devices Crimson Drive (3-knob)Verified
Based on the EarthQuaker Devices Crimson Drive 3-knob· 1 other board clones it
From the post
What? A Monday post? Yep. This week is EarthQuaker week. EQD is easily my favorite pedal company, and I own more of their pedals than any other builder. Not to mention I've learned a lot about pedal design from Jamie's work. So this week I'll be posting 3 EQD circuits and hopefully a video to go along with this week's Fuzz Friday.
To kick EarthQuaker week off, here's the now discontinued Crimson Drive. Did the 2-knob version ages ago, but the 3-knob version was recently posted on FSB so I gave it an update. Beyond the addition of the tone control, there's a few capacitors removed compared to the 2-knob version. The germanium transistor is also different–an NPN instead of the PNP–and the germanium transistors were swapped from 1N60Ps to 1N34As. Easy fit in a 1590B with board mounted pots.
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 7 | ||||
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×2 | 15K | 15k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 3.3nF | 3.3n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N34A | 1N34A | germanium; read from the layout by eye | |
| ×2 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | J201 | J201 | JFET; read from the layout by eye | |
| Q2 | OC139 | OC139 | legend: OC139 or similar NPN germanium; read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | B250K | B250k | Potentiometer | read from the layout by eye |
| Tone | B25K | B25k | Potentiometer | read from the layout by eye |
| Level | B100K | B100k | Potentiometer | read from the layout by eye |
Other boards based on the EarthQuaker Devices Crimson Drive 3-knob
- Earthquaker Devices Crimson Drive 3-knob Dirtbox Layouts