Enclosure not stated · 3 knobs
Keeley 1962/1962XVerified
Based on the Keeley 1962/1962X
From the post
*Edit 20190915* Now a verified layout of Keeley 1962/1962x. The only difference between them is LED or MOSFET clipping in the feedback loop. So the switch alter between 1962 mode and 1962x mode.
Schmidse noticed a couple of errors in the layout, a resistor and a cap across pin 6 and 7 of the op amp were missing. Managed to squeeze them by shifting around a few components and adding a link and a cut.
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 26 rows
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Check before you build · 2 values the reader of this layout was not sure of
- D2 (right of D1, rows I-J) is drawn as a round red LED and D3 (rows L-M) as an ordinary diode, while the legend says D1-D2: 1N4001 and D3: 3mm red LED; rows follow the legend
- Standing resistor at column 14, rows J-L: reads 10K, the mounting hole under the text can make it look like 110K
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 8 | ||||
| ×6 | 10K | 10k | read from the layout by eye | |
| ×4 | 22K | 22k | read from the layout by eye | |
| ×2 | 3.9K | 3.9k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | 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 | |
| ×1 | 1K | 1k | read from the layout by eye | |
| Capacitors 6 | ||||
| ×6 | 10nF | 10n | read from the layout by eye | |
| ×4 | 100nF | 100n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N4001 | 1N4001 | read from the layout by eye | |
| D2 | 1N4001 | 1N4001 | drawn as an LED; read from the layout by eye | |
| D4 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| Q2 | 2N7000 | 2N7000 | MOSFET; read from the layout by eye | |
| Q3 | 2N5457 | 2N5457 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| IC1 | NE5532 | NE5532 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | B100K | B100k | Potentiometer | read from the layout by eye |
| Tone | W20K | W20k | Potentiometer | read from the layout by eye |
| Level | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Switch | DPDT on/on | DPDT ON/ON | toggle; read from the layout by eye | |
| LEDs 1 | ||||
| D3 | 3mm red LED | 3MM RED LED | drawn as a diode; read from the layout by eye | |