Enclosure not stated
DOD 280a
Based on the DOD 280a
- Category
- Compressor· Compressors Gates and Limiters
- Price
- see vendor
- Tags
- Compressors Gates and Limiters
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 17 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- Q1, Q2: part number reads 'NP4124' in a low-resolution font; most likely 2N4124
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 7 | ||||
| ×1 | 3M | 3M | first op amp feedback; read from the schematic by eye | |
| ×1 | 4.7k | 4.7k | VTL5C2 LED to transistor collectors; read from the schematic by eye | |
| ×1 | 10k | 10k | input; read from the schematic by eye | |
| ×3 | 22k | 22k | one in series with 0.05uf on the 500k pot, one bias divider to ground, one bias divider to +9V; read from the schematic by eye | |
| ×1 | 100k | 100k | second op amp feedback; read from the schematic by eye | |
| ×2 | 220k | 220k | transistor base bias; read from the schematic by eye | |
| ×1 | 470k | 470k | bias to + input; read from the schematic by eye | |
| Capacitors 4 | ||||
| ×1 | 0.01uf | 10n | input; read from the schematic by eye | |
| ×4 | 0.05uf | 50n | gain leg, output to level pot, coupling to rectifier transistor, second op amp output; read from the schematic by eye | |
| ×1 | 10uf | 10u | electrolytic, bias filter; read from the schematic by eye | |
| ×1 | 47uf | 47u | electrolytic, rectifier/LED reservoir; read from the schematic by eye | |
| Transistors 2 | ||||
| Q1 | NP4124 | NP4124 | NPN; drawn 'Q1,Q2 = NP4124' in a pixel font, probably 2N4124; read from the schematic by eye | |
| Q2 | NP4124 | NP4124 | NPN; drawn 'Q1,Q2 = NP4124' in a pixel font, probably 2N4124; read from the schematic by eye | |
| ICs 1 | ||||
| ×1 | LM358 | LM358 | dual op amp; both sections used ('Op amps are LM358'); read from the schematic by eye | |
| Opto 1 | ||||
| ×1 | VTL5C2 | VTL5C2 | LED/LDR vactrol in the compression feedback loop; read from the schematic by eye | |
| Potentiometers 2 | ||||
| ×1 | 500k | 500k | Potentiometer | sustain/gain pot (unnamed), in the first op amp's feedback leg; read from the schematic by eye |
| ×1 | 100k | 100k | Potentiometer | output level pot (unnamed); read from the schematic by eye |