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DOD 440 Envelope Filter
Based on the DOD 440 Envelope Filter· 2 other boards clone it
- Category
- Wah / Envelope· Filters Wahs and VCFs
- Price
- see vendor
- Tags
- Filters Wahs and VCFs
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 19 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- Opto module part number unknown (drawing guesses a Vactec VTL)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×2 | 10k | 10k | input series; envelope op amp input; read from the schematic by eye | |
| ×3 | 100k | 100k | filter input; Vref divider; to D pot; read from the schematic by eye | |
| ×3 | 22k | 22k | Vref divider x2; rectifier output to LED; read from the schematic by eye | |
| ×1 | 22k | 22k | D pot to ground; read from the schematic by eye | |
| ×3 | 220k | 220k | filter op amp input; two in series with the LDR halves; read from the schematic by eye | |
| ×1 | 430k | 430k | filter op amp feedback; read from the schematic by eye | |
| ×1 | 470k | 470k | envelope op amp feedback; read from the schematic by eye | |
| Capacitors 7 | ||||
| ×1 | 0.01uF | 10n | input coupling; read from the schematic by eye | |
| ×1 | 0.1uF | 100n | envelope input coupling; read from the schematic by eye | |
| ×1 | 10uF | 10u | electrolytic Vref filter; read from the schematic by eye | |
| ×2 | 0.02uF | 20n | filter; read from the schematic by eye | |
| ×1 | 0.05uF | 50n | output coupling; read from the schematic by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic, envelope op amp output; read from the schematic by eye | |
| ×1 | 1uF | 1u | electrolytic envelope smoothing; read from the schematic by eye | |
| Diodes 1 | ||||
| ×2 | 1N4148 | 1N4148 | envelope rectifier; read from the schematic by eye | |
| ICs 1 | ||||
| ×1 | TL022 | TL022 | dual low-power op amp (each op amp is 1/2 TL022); read from the schematic by eye | |
| Opto 1 | ||||
| ×1 | VTL | VTL | LED/LDR module, unknown; probably a Vactec VTL with LED to center-tapped LDR; read from the schematic by eye | |
| Potentiometers 2 | ||||
| RL | 100k | 100k | Potentiometer | envelope sensitivity, labeled RL; read from the schematic by eye |
| D | 100k | 100k | Potentiometer | labeled D; sets the LED bias; read from the schematic by eye |
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