This Simple 2 LED Battery Status Indicator Circuit work like gas meter but for battery. It uses LED lights to tell how much power battery still have. One light mean battery is full another light mean half power and last light mean time to charge. It use small parts like resistors, Zener diodes and transistors […]
Fast Charger Circuit with Auto Cut Off
This Fast Charger Circuit with Auto Cut Off is fast charger for battery like car battery or backup battery. It charges battery very quick but there is no need worry it wont overcharge. Inside circuit there are have safety part when the battery is full it stops charging by itself. This helps battery stay good […]
Water Level Indicator Circuit with Digital Display
No need to check water with normal stick. This Water Level Indicator Circuit with Digital Display use sensor to check water level. Then it show number from 0 to 9 on small screen, like mini calculator. So we can always see what level the water is in the tank. With this there is no need […]
Long Range FM Transmitter Circuit (2km)
This Long Range FM Transmitter Circuit (2km) send voice or music on FM radio. It can cover up to 2 km range with good antenna. It use small microphone to take sound and then circuit make signal. Signal goes to antenna and any FM radio can catch it. It runs on 12V battery with simple […]
Public Address Amplifier Circuit
This Public Address Amplifier Circuit it works like a very strong loudspeaker for our voice! When we speak on microphone then it makes our voice go very loud because of that many people can hear us good. Good for big place like school, office, stadium or parties where we want all people to hear same […]
30V 1Amp Transformerless Power Supply Circuit
This 30V 1Amp Transformerless Power Supply Circuit works like small adapter for our electronic. It takes normal high voltage electric and change it to low safe voltage to what our devices need. No big transformer is required it uses special parts like capacitor and diode to do the work. Like if we have 30V 1A […]