Acoustic Wellness - Ticking Clock - Maker Factory ELECTRONICS EXPERIMENTS BOX Manual

2.21 Acoustic Wellness – ticking clock
Circuit 51: Relaxing pendulum clock
Setup information
Install the two transistors, the three resistors and the two electrolytic capacitors as shown in Fig. 2.51. 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 tic-toc of a pendulum clock. In our case, the repetition
rate is approximately one tick per second. If your room is not filled with other loud noises, the tic toc of the
clock will contribute to your sense of wellbeing and can stabilize your heart and breathing rate. That, how-
ever, we cannot guarantee.
The circuit diagram for this experiment is shown in Chap. 3, Fig. 3.51.
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Components required:
1 x 2N3904 transistor,
1 x 2N3906 transistor,
1 x 22 Ω resistor, 1 x 1 kΩ
resistor, 1 x 220 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. 2.51: Relaxing pendulum
clock