SD-1 Distortion SMD

This assembled PCB is based on the classic DS-1 circuit and features six switches for customizing gain, clipping, and tone.

COMPONENTS

Potentiometers
GAIN 1M-A 1M OHM Log POTENTIOMETER
VOL 100K-B 100K OHM LINEAR POTENTIOMETER
TONE 20K-W 20K OHM W-TAPER POTENTIOMETER + DUST SEAL

DIP Switch
DIP SWITCH 6 POSITIONS (Optional)

Connector
4 PINS XH-2.54 MALE CONNECTOR (Optional)

PCB

SCHEMATIC

DIP SWITCH SETTINGS

S1 and S2: Gain

S1 OFF, S2 OFF: original gain setting.

S1 ON, S2 ON: lower gain.

S4 and S5: Clipping diodes

S4 OFF, S5 OFF: one pair of LED diodes. Most transparent and least compressed sound.

S4 ON, S5 OFF: one pair of silicon diodes. Original setting. More compressed sound.

S4 OFF, S5 ON: two pairs silicon diodes. More transparent and less compressed sound.

S3 and S6: Tone control

S3 OFF, S6 OFF: Pot at 50%: flatter tone. Pot at max: more bass. Pot at min: more treble.

S3 ON, S6 OFF: original tone setting. Mids scoop.

S3 OFF, S6 ON: mids hump.

S3 ON, S6 ON: Pot at 50%: flatter tone. Pot at max: less bass. Pot at min: less treble.

The following are the frequency responses of the tone section for the potentiometer at 20%, 50% and 80%.

Tone 20%

Tone 50%

Tone 80%

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