1590A · 2 knobs
Emerson Customs EM-DriveVerified
Based on the Emerson Customs EM-Drive· 3 other boards clone it
From the post
Here's a really simple "transparent overdrive" circuit that was a must have a couple years ago. People compared it to the Klon and Timmy drives. Originals use paper in oil caps, which some claim sound better than modern film or ceramic caps. That's a debate for another time though. I've drawn it up so you can use big mojo caps, or with more common caps for a much smaller footprint. Both versions have a couple tweaks. In the mojo layout, I've added a pull down resistor after the gain pot to try and eliminate footswitch pop. In the smaller layout, I've added some optional clipping diodes (which I think really improve the sound of this thing), and power filtering and polarity protection.
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 6 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 2 | ||||
| ×2 | 4.7K | 4.7k | one is the LED resistor; read from the layout by eye | |
| ×2 | 2M | 2M | read from the layout by eye | |
| Capacitors 1 | ||||
| ×2 | 100nF | 100n | large box film; read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | MPSA18 | MPSA18 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Gain | A250K | A250k | Potentiometer | read from the layout by eye |
| Volume | A250K | A250k | Potentiometer | read from the layout by eye |
Other boards based on the Emerson Customs EM-Drive
- The M Drive Five Cats Pedals · £3.50
- EMpathy Drive Fuzz Dog · 1590B · £19.20
- Emerson Custom Guitars Em-Drive Tagboard Effects