Make Noise STO User Manual

Page 10

STO SINE Shape and Amplitude

Trims for SINE shape (1) and Amplitude (3) are accessed through the top side of the module. Take care in

lifting the top half of the module out of case for calibration.

1.Monitor the SINE (3) from the VCO to be calibrated. If possible view

the signal on an oscilloscope and/

or spectrum analyzer as well.

2. Set VCO to be calibrated near to frequency of C4 (4).

3. Set oscilloscope for 2V/ div. by 2ms/ div. (skip to step 4. if no oscilloscope will be used).

4. Trim SINE Shape (1) for least amount of audible harmonics (skip to step 5 if using oscilloscope).

5. If using an oscilloscope or spectrum analyzer adjust so the SINE shape is pure as possible, meaning both

the top and bottom arches are smooth, rounded and glitch free, and harmonics are minimized.

6. Amplitude is adjusted by trim 3. Amplitude should be set using oscilloscope for measurement, to roughly

10.5V peak to peak.

Expect some small amount of harmonics in the SINE shape. Trim to satisfaction and then go make noise!