- Testing -
Testing your Synthesizer
Determine the pattern of notes produced by pressing individual keys
and key combinations (write it down). Use an oscilloscope to measure the
frequencies of all the notes your synthesizer can produce. What are the
Measure your synthesizer's frequencies.
Attach the output of the Synthesizer directly to an oscilloscope. The speed of
the dot moving across the screen is controlled by the
"horizontal sweep" knob. The sweep rate is usually given in seconds/cm, an inverse
representation of speed. In that case, the frequency is the length (cm) of
one cycle divided by the sweep rate (sec/cm).
If you are using a software oscilloscope on a computer, you will not need an amplifier.
Just play (audio) notes with the synthesizer directly into the microphone.
Determine the frequencies produced by your Synthesizer.
(Record the sweep rate and measure the
length of one cycle, then calculate the frequency.)
Experiment by changing resistors in Tone Generator. Be systematic and record your results.
How are resistance and frequency related?
Decide what values of capacitance and resistance would make your tone generator play
the musical note A (440 Hz).
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