Enclosure not stated · 5 knobs
1776 Effects Multiplex Jr.
Based on the 1776 Effects Multiplex Jr· 1 other board clones it
From the post
Schematic and info HERE . Original calls for a VTL5C3 vactrol but since they are obsolete and stupidly expensive the layout calls for a home made vactrol. Just socket the LED and LDR to find the right combo.
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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.
Parts list 40 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 15 | ||||
| ×7 | 10K | 10k | read from the layout by eye | |
| ×4 | 100K | 100k | read from the layout by eye | |
| ×3 | 1K | 1k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×2 | 20K | 20k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 180K | 180k | read from the layout by eye | |
| ×1 | 200K | 200k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×1 | 12K | 12k | read from the layout by eye | |
| ×1 | 5.1K | 5.1k | read from the layout by eye | |
| ×1 | 2.7K | 2.7k | read from the layout by eye | |
| ×1 | 2K | 2k | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 12 | ||||
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×2 | 47nF | 47n | read from the layout by eye | |
| ×2 | 22nF | 22n | read from the layout by eye | |
| ×2 | 10nF | 10n | read from the layout by eye | |
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×2 | 1nF | 1n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 47pF | 47p | read from the layout by eye | |
| ×4 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×3 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| D2 | 1N4001 | 1N4001 | read from the layout by eye | |
| ICs 4 | ||||
| IC1 | TL072 | TL072 | read from the layout by eye | |
| IC2 | TL072 | TL072 | read from the layout by eye | |
| IC3 | PT2399 | PT2399 | read from the layout by eye | |
| REG | 78L05 | 78L05 | regulator; read from the layout by eye | |
| Opto 1 | ||||
| ×1 | LDR | LDR | read from the layout by eye | |
| Potentiometers 5 | ||||
| Time | B50K | B50k | Potentiometer | read from the layout by eye |
| Feedback | B50K | B50k | Potentiometer | read from the layout by eye |
| Mix | B50K | B50k | Potentiometer | read from the layout by eye |
| Depth | B1M | B1M | Potentiometer | read from the layout by eye |
| Speed | B100K | B100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Mod. | SPST | SPST | modulation on/off, switches the Mod. Ind. LED; read from the layout by eye | |
| LEDs 1 | ||||
| D1 | 3mm LED | 3MM LED | on board, paired with the LDR; legend: socket and test; read from the layout by eye | |
Other boards based on the 1776 Effects Multiplex Jr
- 1776 Multiplex Jr. Tagboard Effects