Enclosure not stated · 2 knobs
Auto SwellVerified
Based on the Auto Swell
From the post
Someone showed me this circuit and it's a cool addition to this library. It's an old project from Electronics & Music Makers magazine and allows you to ramp up and down your volume. It's not a true-bypass pedal, but essentially an always-on boost that increases your volume when the momentary footswitch is pushed. More info and schematic can be found in these scans:
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 29 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 2 values the reader of this layout was not sure of
- R8 at the bottom edge of the overlay is printed blurred and reads as 'R6' or 'R8'; taken as R8 because R6 is clearly printed at the top right
- R11 at the left edge is printed split over two lines ('R' / '11') and is partly smudged
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| R1 | 100k | 100k | read from the layout by eye | |
| R2 | 470k | 470k | read from the layout by eye | |
| R3 | 220k | 220k | read from the layout by eye | |
| R4 | 100k | 100k | read from the layout by eye | |
| R5 | 220k | 220k | read from the layout by eye | |
| R6 | 47k | 47k | read from the layout by eye | |
| R7 | 1M | 1M | read from the layout by eye | |
| R8 | 1M | 1M | read from the layout by eye | |
| R9 | 47k | 47k | read from the layout by eye | |
| R10 | 47k | 47k | read from the layout by eye | |
| R11 | 4k7 | 4.7k | read from the layout by eye | |
| R12 | 100k | 100k | read from the layout by eye | |
| R13 | 100k | 100k | read from the layout by eye | |
| R14 | 10k | 10k | read from the layout by eye | |
| Capacitors 7 | ||||
| C1 | 100n | 100n | disc ceramic; read from the layout by eye | |
| C2 | 100n | 100n | disc ceramic; read from the layout by eye | |
| C3 | 100n | 100n | disc ceramic; read from the layout by eye | |
| C4 | 10uF | 10u | electrolytic; read from the layout by eye | |
| C5 | 100n | 100n | disc ceramic; read from the layout by eye | |
| C6 | 10uF | 10u | electrolytic; read from the layout by eye | |
| C7 | 10uF | 10u | electrolytic; read from the layout by eye | |
| Transistors 3 | ||||
| TR1 | BC182L | BC182L | read from the layout by eye | |
| TR2 | BC182L | BC182L | read from the layout by eye | |
| TR3 | BF244 | BF244 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | LF353 | LF353 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Range | A47K | A47k | Potentiometer | RV1, 47k log; read from the layout by eye |
| Rate | A1M | A1M | Potentiometer | RV2, 1M log; read from the layout by eye |
| Trimmers 1 | ||||
| RV3 | 1M | 1M | horizontal preset; read from the layout by eye | |
| Switches 1 | ||||
| S1 | SPST momentary | SPST MOMENTARY | push-to-make foot switch that starts the swell (effect control, not bypass); read from the layout by eye | |