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DOD 440 Envelope Filter
Submitted on March 23, 2004.
Pictures
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Controls
- Sens./Level
- Compensates for different instrument input levels and adjusts the level at which the filter begins to sweep. (this knob is called Sens. on red and blue versions, "Level" on the green versions)
- Range
- adjusts the lowest frequency that the filter settles back to as the input signal decays. If the Sensitivity Control is turned counter clockwise the Range control can manually adjust the filter frequency, like putting a wah pedal in a fixed position for tone coloration.
Specifications
- Input Impedance
- Red version: 150K ohms
Green reissue: 4M ohms- Output Impedance
- Red version: 100K ohms
Green reissue: 100K ohms- Maximum Input Level
- Green reissue: 6 V
- Frequency response
- Red version: 40Hz to 20KHz
- Sweep Range
- Red version: 50Hz to 5KHz
- Battery Drain
- Red version: 1.5 ma
- Power Supply
- 9 V
Various
- used by Johnny Greenwood of Radiohead.
- The manual about the DOD 440 Envelope Filter:
- The DOD Envelope Filter 440 is a Band Pass Filter that can be swept across a portion of the audio range producing a wah wah like effect.
- About the colors:
- 1977: Red version, wires soldered to circuit board, components facing up.
1979: Green version, wires soldered to circuit board, components facing up.
1981 (week 1-12): Blue version, wires soldered to circuit board, components facing up.
1996: Green reissue with "printend circuit board, wires connected with a pin connector, components facing down.
Documentation
- diy project (PCB available, General Guitar Gadgets)
- manual (pdf)
- manual (green version)
- manual (red version)
- schematics
- schematics (Free Info Society)
- schematics available at Schematic Heaven
Related
- DOD 440 Envelope Filter
- Alpha Omega Four 40 - Envelope Filter
- Tone Factor 442 Analogue Filter
- Tone Factor 442 Red Analogue Filter (wider frequency range for bass)
- Boomstick Audio Bottom Feeder (new brand name)
- Mojo Hand Analogue Filter 442 (new brand name)
- Tone Factor 442 Red Analogue Filter (wider frequency range for bass)
DOD 440 Envelope Filter
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