Figure 1 This circuit controls a device through a relay and an intermittent buzzer with only one digitial-I/O pin.. The buzzer remains on for a small amount of time when the relay changes state. You ...

Energy flows to the buzzer and you’ve lost the game. Title: Electrical circuits The mains electricity we use for everyday things like lights, televisions, and washing machines comes from power ...

The flashing is thanks to LEDs with a built-in, integrated flashing circuit and the nasty noise comes from a piezoelectric buzzer — both are available from electronics stores that sell ordinary LEDs ...

The flashing is thanks to LEDs with a built-in, integrated flashing circuit and the nasty noise comes from a piezoelectric buzzer — both are available from electronics stores that sell ordinary LEDs ...