Enclosure not stated · 3 knobs
Keeley 1962Verified
Based on the Keeley 1962
From the post
Take a Blues Breaker and mash it between two Katana boosts and you have the 1962. Couple minor differences from a typical Blues Breaker beyond that. Trace over on FSB. There are two versions of this circuit, the 1962 and the 1962x. As far as I can tell, the only difference between the two is the clipping. I've added a DPDT toggle to switch between the two versions.
There's also a fabricated version in the store, the LXII.
A couple notes:
When I verified the fab'd version I didn't notice much difference tonally between the two clipping settings, so you may want to either leave it out or experiment with that section. I changed the value of the resistor from 9v to the drain of Q3 from 47k in the trace to 22k. Wouldn't bias properly otherwise. Also for the caps with questions marks in the layout above I used 10nF, except for the yellow cap to the right of the IC, which I used 100pF.
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 27 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
Check before you build · 3 values the reader of this layout was not sure of
- Round electrolytic can top left (rows B-D, columns 2-3) is printed '100nF' on both the board and the diagram: printed clearly, unusual value for an electrolytic, probably meant 100uF
- Two film capacitors printed '10nF?' (row D columns 8-10, row F columns 11-13): the drawing itself questions the value
- 3.74K (two, top right and beside Q1), 11K (row H) and 110K (beside the IC): printed clearly, unusual values
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| ×4 | 22K | 22k | read from the layout by eye | |
| ×2 | 3.74K | 3.74k | read from the layout by eye | |
| ×1 | 5.6K | 5.6k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 11K | 11k | read from the layout by eye | |
| ×4 | 10K | 10k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| ×1 | 110K | 110k | read from the layout by eye | |
| ×1 | 4.7K | 4.7k | read from the layout by eye | |
| Capacitors 7 | ||||
| ×4 | 10nF | 10n | read from the layout by eye | |
| ×2 | 10nF | 10n | printed '10nF?'; 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 | ? | ? | ceramic, value not given (printed '?'); read from the layout by eye | |
| ×1 | 100nF | 100n | electrolytic, printed '100nF'; read from the layout by eye | |
| ×1 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×3 | 1N4001 | 1N4001 | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | 2N5458 | 2N5458 | JFET; read from the layout by eye | |
| Q2 | 2N7000 | 2N7000 | MOSFET; read from the layout by eye | |
| Q3 | 2N5458 | 2N5458 | JFET; read from the layout by eye | |
| ICs 1 | ||||
| ×1 | 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 | read from the layout by eye | |
| LEDs 1 | ||||
| D1 | 3mm diffused red LED | 3MM DIFFUSED RED LED | on the board; read from the layout by eye | |