This simple STM setup utilises a piezoelectric actuator constructed by deliberately cutting a piezo speaker into four quadrants. With individual drive wires attached to the four quadrants.

1. Fig. 2 shows the circuit diagram of the multiwire continuity tester. The circuit is built around the CD4047 (IC1), the 4017 decade counter (IC2), ten LEDs, a BC548 transistor (T1), a piezo-buzzer, ...

Connect a piezo buzzer or speaker to pin 11 or select a new pin.

One of the simple yet interesting connection diagrams that young engineers learn in their lab is the staircase lighting setup.

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