Enclosure not stated · 2 knobs
1776 Multiplex Delay Modulation Add-onVerified
Based on the 1776 Effects Multiplex Delay Modulation Add-on
- Category
- Vibrato / Chorus
- Build
- Vero· 13×9· 9 cuts, 6 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- 1776 Effects, Chris Stelloh, Modulation
From the post
A little useful modulation daughterboard for your delay circuits. Created by the one and only Chris Stelloh. I originally made this for Ben Spinks, who verified it. It's the modulation daughterboard for the 1776 Effects Multiplex delay and it works pretty well with just about any PT2399 delay circuit. I've listed my preferred values as well as the originals from the build document. You can add a toggle between the mod depth and the delay pot to turn it off and on, but if you simply max the speed/rate knob, the modulation is no longer audible and the rate LED is static.
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 13 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | printed 2m2; read from the layout by eye | |
| R7 | 330K | 330k | 180k in original; read from the layout by eye | |
| Capacitors 2 | ||||
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | TL072 | TL072 | any dual op amp should do; read from the layout by eye | |
| Opto 1 | ||||
| LDR | 1M dark resistance | 1M DARK RESISTANCE | original recommends 10m dark/VTL5C3 vactrol; read from the layout by eye | |
| Potentiometers 2 | ||||
| Speed | C100K | C100k | Potentiometer | originally B100k; read from the layout by eye |
| Depth | B1M | B1M | Potentiometer | read from the layout by eye |
| LEDs 2 | ||||
| D2 | 5mm diffused yellow | 5MM DIFFUSED YELLOW | on board, faces the LDR; read from the layout by eye | |
| Speed LED | 5mm diffused yellow | 5MM DIFFUSED YELLOW | off-board rate indicator; read from the layout by eye | |