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Experiment
It is still used in systems where PCs are utilized to control machines such as: the serial interface RS-232C
of a computer from the days of infancy. If you would like to connect an CNC milling machine or one of the
unrivalled practical PSION pocket computers (s3mx or s5mx), our circuit can help to overcome connection
issues. Please note that positive voltage levels (+3V to +15V) are Logical 0 and negative voltage levels (-3V to
-15V) are Logical 1.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.149.
2.72 Simple RC sine wave generator
Circuit 150: Simple tone generator 1 kHz
Setup information
Install the transistor, the five resistors and the three ceramic capacitors and the electrolytic capacitor as
shown in Fig. 2.150. The thirteen jumper wires come next. Last but not least connect the Piezo element.
Check the placement on the board again and only then connect the battery. You can significantly increase
the sensitivity of the Piezo element by using a sound plate or even a sound box. Read more about it in
Chap. 1.2.3
Components required:
1 x 2N3904 transistor,
1 x 47 Ω resistor,
1 x 2.2 kΩ resistor,
2 x 4.7 kΩ resistors,
1 x 220 kΩ resistor,
3 x 10 nF ceramic
capacitors, 1 x 10 μF
electrolytic capaci-
tor, 1 x Piezo element,
1 x breadboard, 1 x 9V
battery with clip con-
nector
Fig. 2.150: Simple tone
generator 1 kHz
175
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