1590A · 3 knobs
Fairfield Barbershop - 1590AVerified
Based on the Fairfield Barbershop - 1590A
From the post
Continuing on with my 1590A kick, here's one for the Barbershop Overdrive from Fairfield Circuitry. I've modified a few things: first, the polarity protection of the original is a bit excessive, so that's been simplified. And secondly, I included 2 trimmers to help set the bias of the J201s (you're welcome, Cody). With 3 pots you'll need to use 9mm pots and the 220uF cap is on it side to fit better in the enclosure and hopefully not get in the way of the input jack. Drilling template can be found 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 Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.
Parts list 18 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 47Ω at the top by +9v: printed clearly, low value but plausible as the supply series resistor
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×3 | 1K | 1k | read from the layout by eye | |
| ×2 | 4.7K | 4.7k | one is the LED series resistor; read from the layout by eye | |
| ×2 | 33K | 33k | read from the layout by eye | |
| ×2 | 2M | 2M | read from the layout by eye | |
| ×1 | 47Ω | 47 | read from the layout by eye | |
| Capacitors 6 | ||||
| ×2 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 220uF | 220u | electrolytic; read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×1 | 47nF | 47n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 100pF | 100p | read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | J201 | J201 | JFET; read from the layout by eye | |
| Q2 | J201 | J201 | JFET; read from the layout by eye | |
| Q3 | 2N2222A | 2N2222A | read from the layout by eye | |
| Potentiometers 3 | ||||
| Drive | A100K | A100k | Potentiometer | pads labelled Gain; read from the layout by eye |
| Sag | B10K | B10k | Potentiometer | read from the layout by eye |
| Volume | A10K | A10k | Potentiometer | read from the layout by eye |
| Trimmers 1 | ||||
| ×2 | 20K | 20k | read from the layout by eye | |