ASM321 Basic VCO
ELBY Designs - Laurie Biddulph
9 Follan Close, Kariong, NSW 2250, Australia
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Calibration
Initially you need to calibrate the ASM VCO Core board and should follow the instructions in the
Core build notes
.
The remaining calibration process is for setting the wave shaper outputs:-
SAWTOOTH Output
1. Monitor the [SAWTOOTH] output
2. Set the [COARSE] and [FINE] controls so that the output is running at around 100Hz
3. Adjust P201 until the waveform is centred around 0V
TRIANGLE Output
1. Monitor the [TRIANGLE] output
2. Adjust P303 until the output is about 4V pk-pk
3. Adjust P301 for optimum waveshape
4. Adjust P302 until the waveform is centred around 0V
5. Adjust P303 until the output is about 5V pk-pk
6. Repeat steps (3) to (5) for best triangle wave shape
SINE Output
1. Monitor the [SINE] output
2. Adjust P306 until the output is about 4V pk-pk
3. Adjust P305 for optimum symmetry
4. Adjust P304 for optimum waveshape
5. Adjust P306 until the output is 5V pk-pk
6. Repeat steps (3) to (5) for best sine wave shape
