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Circuit 52: Stimulating mantel clock
Setup information
Install the two transistors, the three resistors and the two electrolytic capacitors as shown in Fig. 2.52. The
five 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
Experiment
This circuit delivers an acoustic sound similar to the ticking of a mantel clock. In our case the repetition rate
is approximately one beat per second. If your room is not filled with other loud noises, the ticking of the
clock will contribute to your sense of wellbeing. The beat is stimulating. This, however, we cannot guaran-
tee.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.52.
Components required:
1 x 2N3904 transistor,
1 x 2N3906 transistor,
1 x 22 Ω resistor, 1 x 1 kΩ
resistor, 1 x 100 kΩ resis-
tor, 2 x 10 μF electrolytic
capacitors, 1 x Piezo ele-
ment, 1 x breadboard,
1 x 9V battery with clip
connector
Fig. 2.52: Stimulating mantel
clock
77
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