Enclosure not stated · 3 knobs
CBS Arbiter DoublerVerified
Based on the CBS Arbiter Doubler· 1 other board clones it
From the post
Thanks to Pawel for his schematic posted on FSB. I can't find much info on this one or clips, but it is very close to being a Foxx Tone Machine so that should give you a good idea what to expect.
Pawel traced two units with the second being slightly different, using BC109 transistors, the 100K Q3 base resistor is 150K, the 5n cap is 3n3, and all pots are 100K log, so build whichever one takes your fancy, or socket the positions to try both.
Demo of the British Pedal Company Doubler which is a copy
Working voltages as posted by ξεναγός νεκρόπολης:
q1 e 1,11 b 1,65 c 3,95 q2 e 3,49 b 4,02 c 9,08 q3 e 0,56 b 1,16 c 3,55 q4 e 0,21 b 0,78 c 7,82
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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 29 rows
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Check before you build · 1 value the reader of this layout was not sure of
- 5n next to Q4 (upper left): printed clearly, unusual value
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 270R | 270 | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| ×1 | 1K5 | 1.5k | read from the layout by eye | |
| ×3 | 4K7 | 4.7k | read from the layout by eye | |
| ×3 | 10K | 10k | read from the layout by eye | |
| ×1 | 15K | 15k | read from the layout by eye | |
| ×1 | 22K | 22k | read from the layout by eye | |
| ×3 | 47K | 47k | read from the layout by eye | |
| ×6 | 100K | 100k | read from the layout by eye | |
| ×1 | 470K | 470k | read from the layout by eye | |
| ×1 | 1M | 1M | read from the layout by eye | |
| Capacitors 6 | ||||
| ×1 | 1n | 1n | read from the layout by eye | |
| ×1 | 5n | 5n | read from the layout by eye | |
| ×1 | 47n | 47n | read from the layout by eye | |
| ×2 | 100n | 100n | read from the layout by eye | |
| ×9 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100u | 100u | electrolytic; read from the layout by eye | |
| Diodes 4 | ||||
| D1 | 1N4148 | 1N4148 | read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | read from the layout by eye | |
| D3 | 1N4148 | 1N4148 | read from the layout by eye | |
| D4 | 1N4148 | 1N4148 | read from the layout by eye | |
| Transistors 4 | ||||
| Q1 | BC549 | BC549 | read from the layout by eye | |
| Q2 | BC549 | BC549 | read from the layout by eye | |
| Q3 | BC549 | BC549 | read from the layout by eye | |
| Q4 | BC549 | BC549 | read from the layout by eye | |
| Potentiometers 3 | ||||
| Sustain | B1K | B1k | Potentiometer | read from the layout by eye |
| Filter | A50K | A50k | Potentiometer | read from the layout by eye |
| Volume | A50K | A50k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Octave | SPST | SPST | footswitch; legend: SPST stomp, or DPST/DPDT if you want octave LED indication; read from the layout by eye | |
Other boards based on the CBS Arbiter Doubler
- CBS Arbiter Doubler Dirtbox Layouts