1590A · 1 knob
EQD BowsVerified
Based on the EarthQuaker Devices Bows· 4 other boards clone it
From the post
Here's Jamie's take on the classic Rangemaster circuit, with a NPN germanium transistor. There's an added toggle to switch between full range and treble input caps. Probably a tight a squeeze in a 1590A but should be doable. There is also a 1590A specific PCB with board mounted pot and switch in the store now (link below).
EFFECTS LAYOUTS BEAUREGARD
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 12 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×1 | 100Ω | 100 | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 68K | 68k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×2 | 1M | 1M | read from the layout by eye | |
| Capacitors 3 | ||||
| ×1 | 4.7nF | 4.7n | read from the layout by eye | |
| ×2 | 100nF | 100n | read from the layout by eye | |
| ×2 | 47uF | 47u | electrolytic; read from the layout by eye | |
| Diodes 1 | ||||
| ×1 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 1 | ||||
| Q1 | OC139 | OC139 | or similar NPN germanium; read from the layout by eye | |
| Potentiometers 1 | ||||
| Level | B10K | B10k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Tone | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |
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