Based On: DOD 440 Enevolpe Filter

EF440 project by General Guitar Gadgets

This is a DOD Envelope Filter 440 replica called EF440. It is a very nice little filter circuit. Probably the simplest to build filter we have on the site. We made the layout of the PCB very small so that it will fit in a box the size of the original unit.

Download Schematic

More info from the Original Website (or PCB order)

Additional information

Based On

DOD 440 Enevolpe Filter

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