Enclosure not stated · 1 knob
DOD 230 Optical Noise GateVerified
Based on the DOD 230 Optical Noise Gate· 3 other boards clone it
- Category
- Noise Gate
- Controls
- Threshold
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- DOD, Noise Suppressor
From the post
Not a lot out there on this one. It's a optical noise gate DOD produced in the late 70s and works best at the beginning of your signal chain. The original had a very strange way of bypass switching, but I've omitted this as your true-bypass method of choice is probably much superior. Originals used a VTL5C2, but experiment with LED and LDR combos, and possibly the value of the resistor feeding the LED (10k right above the LDR and Q1).
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 21 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×5 | 1M | 1M | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×3 | 22K | 22k | read from the layout by eye | |
| ×2 | 220K | 220k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 100Ω | 100 | read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 120pF | 120p | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×1 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | 2N3904 | 2N3904 | read from the layout by eye | |
| ICs 2 | ||||
| IC1 | TL022 | TL022 | read from the layout by eye | |
| IC2 | LM358 | LM358 | read from the layout by eye | |
| Opto 1 | ||||
| ×1 | LDR | LDR | value not given; read from the layout by eye | |
| Potentiometers 1 | ||||
| Threshold | A500K | A500k | Potentiometer | read from the layout by eye |
| LEDs 1 | ||||
| D1 | ? | ? | value not given; drawn as a red LED on the board; read from the layout by eye | |
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