Enclosure not stated · 3 knobs
DAM FZ-781 J Type FuzzVerified
Based on the DAM FZ-781 J-Type Fuzz· 2 other boards clone it
From the post
Thanks to beedotman for the schematic on FSB. This uses a 4 position rotary switch to swap the output cap, but none of the values used in the switch are confirmed, so as usual with anything like this it's a much better idea to use the values which suit your taste and gear better anyway rather than someone elses choice so I'd consider auditioning them and keeping the ones you think are most useful for you. It is intended that the caps are soldered directly to the rotary switch as shown in the diagram but you could extend the board by a few columns, solder them there and take wires to the switch if you prefer.
With this being a positive ground effect like the FZ-673 posted yesterday, some people may prefer to use a negative voltage inverter for both to provide -9V to allow this to be daisy chained with negative ground effects.
I can't find an official description for this pedal which I'm assuming was one of DAM's limited runs. But it sounds pretty good in this vid:
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 22 rows
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Check before you build · 1 value the reader of this layout was not sure of
- Switch caps 5n6/15n/22n/56n: printed clearly but the drawing states they are not confirmed
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 6 | ||||
| ×1 | 470R | 470 | read from the layout by eye | |
| ×1 | 100R | 100 | read from the layout by eye | |
| ×2 | 10K | 10k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 8K2 | 8.2k | read from the layout by eye | |
| Capacitors 9 | ||||
| ×2 | 5n6 | 5.6n | one on the board, one on the rotary switch between pins 1 & 5 (switch value not confirmed); read from the layout by eye | |
| ×1 | 10n | 10n | read from the layout by eye | |
| ×1 | 100n | 100n | read from the layout by eye | |
| ×1 | 15n | 15n | on rotary switch between pins 2 & 6, value not confirmed; read from the layout by eye | |
| ×1 | 22n | 22n | on rotary switch between pins 3 & 7, value not confirmed; read from the layout by eye | |
| ×1 | 56n | 56n | on rotary switch between pins 4 & 8, value not confirmed; read from the layout by eye | |
| ×1 | 4u7 | 4.7u | electrolytic; read from the layout by eye | |
| ×1 | 10u | 10u | electrolytic; read from the layout by eye | |
| ×1 | 47u | 47u | electrolytic; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | OC82DM | OC82DM | read from the layout by eye | |
| Q2 | OC82DM | OC82DM | read from the layout by eye | |
| Q3 | OC82DM | OC82DM | read from the layout by eye | |
| Potentiometers 3 | ||||
| Filter | B100K | B100k | Potentiometer | read from the layout by eye |
| Fuzz | B1K | B1k | Potentiometer | read from the layout by eye |
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Switches 1 | ||||
| Rotary | 3P4T rotary | 3P4T ROTARY | selects the switch capacitor; read from the layout by eye | |
Other boards based on the DAM FZ-781 J-Type Fuzz
- DAM FZ-781 J-Type Fuzz Dirtbox Layouts
- DAM FZ-781 J-Type Fuzz Dirtbox Layouts