Enclosure not stated · 2 knobs
Guyatone PS-106 Double OctaveVerified
Based on the Guyatone PS-106 Double Octave
From the post
Chris Stelloh sent me an old handrawn factory(?) schematic of this old glitchy octave down fuzz (once again, thanks Chris!). It is obviusly inspired by MXR Blue Box but several tweaks and mods had been done such a "Normal" control for clean signal and an octave switch. The original schematic was quite a mess so we had to clean it up in order to do a layout. Chris built it up and he eventually verified it. So here it is...an old forgotten. vintage octave down fuzz!
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 31 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×9 | 56K | 56k | read from the layout by eye | |
| ×5 | 10K | 10k | read from the layout by eye | |
| ×3 | 1M | 1M | read from the layout by eye | |
| ×2 | 470K | 470k | read from the layout by eye | |
| ×1 | 220K | 220k | read from the layout by eye | |
| ×1 | 150K | 150k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 2.2M | 2.2M | read from the layout by eye | |
| ×1 | 1K | 1k | read from the layout by eye | |
| R1 | ? | ? | value not given; legend suggests 470k; read from the layout by eye | |
| ×1 | ? | ? | LED resistor, value not given; read from the layout by eye | |
| Capacitors 8 | ||||
| ×3 | 47nF | 47n | read from the layout by eye | |
| ×1 | 10nF | 10n | read from the layout by eye | |
| ×1 | 1nF | 1n | read from the layout by eye | |
| ×1 | 330pF | 330p | read from the layout by eye | |
| ×4 | 1uF | 1u | electrolytic; read from the layout by eye | |
| ×1 | 10uF | 10u | electrolytic; read from the layout by eye | |
| ×1 | 100uF | 100u | electrolytic; read from the layout by eye | |
| C3 | ? | ? | electrolytic; value not given; legend suggests 10uF; read from the layout by eye | |
| Diodes 3 | ||||
| D1 | 1N4148 | 1N4148 | legend: 1N4148/1N914 (1S953 in original); read from the layout by eye | |
| D2 | 1N4148 | 1N4148 | legend: 1N4148/1N914 (1S953 in original); read from the layout by eye | |
| D3 | 1N5817 | 1N5817 | read from the layout by eye | |
| Transistors 2 | ||||
| Q1 | 2N3904 | 2N3904 | legend: 2N3904, 2N5088 etc. (2SC396-F in original); read from the layout by eye | |
| Q2 | 2N3904 | 2N3904 | legend: 2N3904, 2N5088 etc. (2SC396-F in original); read from the layout by eye | |
| ICs 4 | ||||
| IC1 | 1458 | 1458 | read from the layout by eye | |
| IC2 | 1458 | 1458 | read from the layout by eye | |
| IC4 | 1458 | 1458 | read from the layout by eye | |
| IC3 | CD4013 | CD4013 | read from the layout by eye | |
| Potentiometers 2 | ||||
| Normal | B50K | B50k | Potentiometer | legend: try 100kB for a bit more output volume; read from the layout by eye |
| Octave | B50K | B50k | Potentiometer | legend: try 100kB for a bit more output volume; read from the layout by eye |
| Switches 1 | ||||
| Switch | SPDT on/on | SPDT ON/ON | toggle; read from the layout by eye | |