Handling 220V AC directly is very dangerous, but still we need to know mains is ON or OFF. So, this 220V AC Live Detection and Interface Circuit is useful as it solves this safety problem easily. This circuit senses mains voltage safely and it sends clean logic level signal. Optocoupler is used for isolation, so […]
Sensors and Detectors
Darkness Activated LED Circuit
This article explains about a Darkness Activated LED Circuit which is useful device that saves power. It is energy efficient circuit because light glows only in darkness. The circuit turns ON light at night and it turns OFF light in day time. It works fully automatic so, no manual switch is needed daily. It is […]
Automatic PIR Motion Sensor Light Circuit
This project explains about a complete Automatic PIR Motion Sensor Light Circuit. It is very useful for home and outdoor lighting, because the circuit uses a PIR sensor. Whenever motion is detected the light turns ON automatically. After some time, the light turns OFF and therefore, power is saved. Also, through this circuit the human […]
Simple PIR Sensor Timer Circuit using Transistors
Here, is a article for a Simple PIR Sensor Timer Circuit using Transistors. It is with low cost and easy to build and it works with 12V DC supply. When motion is detected the output stays ON for some time. After delay the output turns OFF automatically. Hence, this circuit is useful for lights, alarms […]
PIR Sensor Motion Alarm Circuit Transistor and Relay
Nowadays, security is very important that why homes and shops need protection. So to safeguard this motion sensor circuits are useful. PIR Sensor Motion Alarm Circuit Transistor and Relay is simple. It uses very few components and is with low cost and is also is easy to build. The circuit works using a PIR sensor […]
Simple Transistor Based Touch Switch Circuit
This article is about is a Simple Transistor Based Touch Switch Circuit. It works when finger touches the pad with no push button used. Human body gives small signal and circuit senses this signal. Two NPN transistors are used and one LED is used as output. Circuit works with only 3V supply which is very […]