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
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
I like to learn about the circuits used to detect temperature and light. To control various loads. Are you the same as me? Here is an On-Off Light or Temperature Controller Circuit using a 741 OP-AMP Comparator. Some people say that learning simple circuits is a waste of time. Because in this era, almost everything … Read more
Here is temperature sensor diode 1N4148 silicon type and 741- op amp, so easy. The Output to voltmeter. You will learn why diode becomes temperature sensor. Read more