Ultrasonic Security Alarm Circuit work like invisible wall for ones home. It uses very high sound wave like tiny squeaky noise which human ear can not hear it uses this to find the movement. Think like circuit sends sound wave then it waits to hear echo come back. If someone walk in the way and […]
Wireless RF Network Cable Tester Circuit
Wireless RF Network Cable Tester Circuit is like X-ray for internet wire. It can catch radio signal inside cable like ethernet, modem or satellite TV but there is no need to touch the wire. It is very easy to use for checking cable working or not. Just hold tester near the wire and it will […]
Simple Temperature Meter Circuit
Simple Temperature Meter Circuit is like small detective for heat. It use special sensor like thermocouple or thermistor to feel heat near it. Sensor can be small part or smart chip like LM35 or LM34 which change heat into electric signal. Then circuit take this signal and confirms how much hot or cold it is. […]
Simple Radiation Sensor Circuit
Simple Radiation Sensor Circuit is like small spy for rays which one cannot see. It can smell different radiation like from light bulb, electromagnetic, or X-ray (ionizing one) etc. This circuit have special sensor when radiation detects sensor feels it and send signal. The circuit then uses that signal to modify things such as showing […]
Simple USB Reading Lamp Circuit
Simple USB Reading Lamp Circuit is like small power house for ones book reading. It helps to make small lamp easy to carry and it take power from USB port like from computer, laptop or power bank also. This small lamp give light when one wants to read book or need more light on the […]
Simple UJT LED Flasher Circuit
Simple UJT LED Flasher Circuit is very simple way to make LED blink ON and OFF. It uses special transistor name UJT which one work like small flasher switch. UJT give pulse electric and make LED ON and OFF again and again with same time always. This circuit is good for fun DIY project where […]