Enclosure not stated · 2 knobs
DOD FX25 Envelope FilterVerified
Based on the DOD FX25 Envelope Filter· 3 other boards clone it
- Category
- EQ / Filter
- Controls
- Sensitivity · Range
- Build
- Perfboard
- Layout
- Verified · Effects Layouts (blog) marks it as built and working
- Tags
- Auto-Wah, Bass, DOD, Filter
From the post
The FX25 was initially produced by DOD in the early 80s and is an OTA-based envelope filter/auto-wah. It's a fairly tweakable and you can find various mods on other sites, but this is for the stock layout. The original switching circuitry has been removed, so you can use true-bypass. An LM1458 is listed in the layout below, but just about any dual op-amp should work there (TL072, NE5532, JRC4558, etc.), so if you get a little distortion, try a different op-amp.
Update Aug. 10, 2016:
I've fixed the layout as per NapAlpha and Eduardo's comments below. Thanks for catching that guys. Sorry it took me so long to make the fix.
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 23 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×4 | 10K | 10k | read from the layout by eye | |
| ×7 | 22K | 22k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×5 | 1K | 1k | read from the layout by eye | |
| ×1 | 51Ω | 51 | read from the layout by eye | |
| Capacitors 8 | ||||
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×3 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 330uF | 330u | electrolytic; read from the layout by eye | |
| ×2 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 22uF | 22u | electrolytic; read from the layout by eye | |
| Diodes 2 | ||||
| ×2 | 1N4148 | 1N4148 | read from the layout by eye | |
| ×1 | 1N4001 | 1N4001 | read from the layout by eye | |
| ICs 2 | ||||
| ×1 | LM1458 | LM1458 | read from the layout by eye | |
| ×1 | LM13600 | LM13600 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Sensitivity | B100K | B100k | Potentiometer | read from the layout by eye |
| Range | B100K | B100k | Potentiometer | read from the layout by eye |
Other boards based on the DOD FX25 Envelope Filter
- Michelenvelope Moonn Electronics · €5.50
- Waddle Box PedalPCB · 125B · $8.00
- DOD FX25 Envelope Filter Tagboard Effects