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Sometimes there is a need to switch on or off electrical appliances or gadgets after a predetermined time. The circuit presented here can switch on/off any electrical appliance (load) through a relay switch after the specified time set in...
Some of the mosquito repellent available in the market use a toxic liquid to generate poisonous vapours in order to repel mosquitoes out of the room. Due to the continuous release of poisonous vapours into the room, after midnight...
Charging of the cellphone battery is a big problem while travelling as power supply source is not generally accessible. If you keep your cellphone switched on continuously, its battery will go flat within five to six hours, making the...
Presented here is a sensitive alarm using a vibration sensor for application as a simple surveillance system for protecting doors and windows. It can also be used as a luggage or locker protector. The circuit beeps and lights a...
Do you want to get an early warning of brake failure while driving? Here is a brake failure indicator circuit that constantly monitors the condition of the brake and gives an audio-visual indication. When the brake is applied, the...
Here is a simple optoreflective sensor circuit based on TCRT5000 module. It is ideal for projects like robotics, position sensing, proximity sensing, detection of reflective materials and many more. Its range is 2mm to 10mm, and the best response...
Presented here is a power-saving LCD backlight control circuit. An LCD is used in many projects for indication or information display since it consumes less power and, hence, saves energy. But power consumption in an LCD backlight draws a lot...
LPG gas is supplied in pressurised steel cylinders. As this gas is heavier than air, when it leaks from a cylinder it flows along floor and tends to settle in low spots such as a basement. This can cause...