Enclosure not stated · 6 knobs
Schumann F LoopVerified
Based on the Schumann F Loop
- Category
- EQ / Filter
- Build
- Vero· 28×24· 58 cuts, 30 links
- Layout
- Verified · Dirtbox Layouts marks it as built and working
- Tags
- Dead End Fx, Feedback Looper, Filter, Modulation, Noise, Schumann
From the post
Here is a an old, rare and weird one traced by Deadend Fx. It is a feedback looper that includes both modulation and an active filter sections. If you you don't like the hassle with the offboard wiring this layout requires, Deadend Fx has nifty PCBs for sale. Schematic and more info HERE.
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 36 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 9 | ||||
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×2 | 2.2K | 2.2k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 27K | 27k | read from the layout by eye | |
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 7 | ||||
| ×1 | 10pF | 10p | read from the layout by eye | |
| ×2 | 5.6nF | 5.6n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×3 | 2.2uF | 2.2u | electrolytic; read from the layout by eye | |
| ×1 | 4.7uF | 4.7u | electrolytic; read from the layout by eye | |
| ×3 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | bipolar electrolytic (BP); read from the layout by eye | |
| Diodes 3 | ||||
| ×2 | 1N914 | 1N914 | D1, D2; read from the layout by eye | |
| D4 | 1N5817 | 1N5817 | read from the layout by eye | |
| D5 | 10V Zener | 10V | read from the layout by eye | |
| ICs 5 | ||||
| IC1 | CD4066N | CD4066N | read from the layout by eye | |
| IC2 | CD4069N | CD4069N | read from the layout by eye | |
| IC3 | LF353N | LF353N | read from the layout by eye | |
| IC4 | LF347N | LF347N | read from the layout by eye | |
| IC5 | LT1054 | LT1054 | read from the layout by eye | |
| Opto 1 | ||||
| Vactrol | VTL5C3 | VTL5C3 | legend: VTL5C3 or LED/LDR combo; read from the layout by eye | |
| Potentiometers 6 | ||||
| Attack | B1M | B1M | Potentiometer | read from the layout by eye |
| Decay | B1M | B1M | Potentiometer | read from the layout by eye |
| Filter | B10K | B10k | Potentiometer | read from the layout by eye |
| Rate | B100K | B100k | Potentiometer | read from the layout by eye |
| Input | A1M | A1M | Potentiometer | read from the layout by eye |
| Output | A15K | A15k | Potentiometer | legend: 15kA or 20kA; read from the layout by eye |
| Switches 4 | ||||
| Filter | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| Phase | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
| LFO | DPDT on/on | DPDT ON/ON | toggle; read from the layout by eye | |
| Momentary | DPDT momentary | DPDT MOMENTARY | footswitch; read from the layout by eye | |
| LEDs 1 | ||||
| D3 | LED | LED | on the board, type not given; read from the layout by eye | |