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Hands-On-Physics
WAVES
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Core
Project
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- More Tones -
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Adding Notes
The tone generator can be made into a synthesizer by modifying it so it
can produce a variety of tones. The trick is to change the values of the
resistors or capacitors (or both).
Experiment with four different resistors to see (hear) how they
change the frequency produced by the tone generator. Keep the 0.1 microfarad capacitor,
but replace the 10K Ohm resistor.
Try these values of resistance, approximately:
- 1 K Ohm,
- 2 K Ohms,
- 5 K Ohms, and
- 20 K Ohms.
Experiment with four different capacitors to see (hear) how they
change the frequency produced by the tone generator. Keep the 10 K Ohm resistor,
but replace the 0.1 microfarad capacitor.
Try these values of capacitance, approximately:
- 0.1 micro farads,
- 0.2 micro farads,
- 0.5 micro farads, and
- 2.0 micro farads.
Test the Tone Generator's new frequencies.
Attach the output of the tone generator to an oscilloscope.
Record the sweep rate and measure the length of one cycle for
each different capacitor, then calculate the frequencies
produced.
Build a keyboard. Attaching this keyboard will make the tone generator into a synthesizer.
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