555 Timer

Infrared Intruder Alarm circuit diagram

This is an Infrared Intruder Alarm circuit that interesting. Imagine some people walk through restricted areas. At that moment, this circuit immediately sounded to alert you. It uses the principle of cut the infrared light. The circuit will recognize, control relay runs, and turns on a warning signal like a siren for us to hear. … Read more

Learn audio transmission with light

light-to-sound-wave-receiver-using-ic-741

Believe it or not. We can send the audio with light. Today was fun for friends to play with their children, Learn about the equipment or use a transducer system. The change of light energy. Into electrical energy. And the change of electrical energy into sound. Change from light to sound. Light that we see. … Read more