Enclosure not stated · 2 knobs
EarthQuaker Devices Crimson DriveVerified
Based on the EarthQuaker Devices Crimson Drive· 3 other boards clone it
From the post
A couple of the electro caps look to be the wrong way round to me but this is definitely as per the scheme and it was by Dirk and so a trusted source.
Info about the original:
The EarthQuaker Devices Crimson Drive is an all-analog, dynamic overdrive that uses a germanium transistor and vintage germanium diodes to create an abundant, open sounding tone that simply isn’t available through FET or Opamp driven effects. The Crimson Drive works beautifully with both humbucker and single coil pickups to get the most out of your amplifier by pushing your preamp tubes into natural overdrive with a choice bit of distorted input boost. The Gain knob gives you control over a broad sweep of harmonically rich effects from a well-textured treble boost to an abundance of viscerally satisfying plexi grit. The low pass Tone control dials back the high end while the Level control keeps the damage to a reasonable level. The Crimson Drive responds to your playing and cleans up with your guitar’s volume control. It is Made in the USA, wired for true bypass, and operates on a standard 9vDC power supply or a battery.
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 19 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 2K2 | 2.2k | read from the layout by eye | |
| ×2 | 4K7 | 4.7k | read from the layout by eye | |
| ×1 | 2M2 | 2.2M | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×2 | 100n | 100n | read from the layout by eye | |
| ×1 | 100p | 100p | read from the layout by eye | |
| ×2 | 1u | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×3 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| D1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ×2 | 1N60P | 1N60P | D2, D3; read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | J201 | J201 | JFET; read from the layout by eye | |
| Q2 | AC128 | AC128 | germanium; read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | B100K | B100k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
Other boards based on the EarthQuaker Devices Crimson Drive
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