DIRTY BIRD |
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AUDIO
CLIPS:
BASS GUITAR |
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The
schematic and PCB layout files for the Dirty Bird are in ExpressPCB
format. If you don't have it already, it's a free
download. The two switches for Q and Flutter could be 3-position rotary switches, but I used toggle switches instead, because I wanted to fit everything into a small 1590B enclosure. So, for the Flutter switch, I used a 3-position (center-off) DPDT toggle switch, shown as sw3a and sw3b in the schematic. For the Q switch, I used a 3-position (center-off) SPDT toggle switch, shown as sw4. For the Q switch, the resistor values shown in the schematic will be pretty good if a SP3T rotary switch is used. But, I used different values to get the same result with a 3-position toggle switch. I put a 2M7 resistor on the center pole of a SPDT, and 1M5 and 560K resistors on the outside throws. That way, with the switch in the center position, the resistance thru the switch is 2M7. And, when it's in either the fully up or fully down position, the value of the resistors in parallel will approximately add up to the other two values shown in the schematic. Of course, one of the stompswitches is for bypass. The other one is called Chirp, and is shown in the schematic as the momentary switch (sw2) between the base and collector of the transistor. Stepping on it changes the character of the fuzz, making it less stuttery with some settings, and more piercing sounding with other settings. A regular on/off stompswitch, instead of a momentary one, would probably be cool, too.
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