Gas Leakage Alarm
Here is a circuit that detects the leakage of LPG gas and alerts the user through audio-visual indications. More >
Courtesy Light with Time Delay Switch Aspect
The circuit was constructed to provide a time delay feature when switching OFF a light to give the person enough time to reach the bed before the lamp completely turns OFF. More >
Battery Circuit for Backup/Standby Operation
The circuit was designed to create a spare and reserve power source with the use of batteries during the absence of power from the mains. More >
Single Voltage Supply with Symmetrical Output
The circuit has been made for the creation of a symmetrical voltage that would come from a single power supply. More >
Dummy Alarm with Flashing LED
A LED flashing briefly once every 5 seconds to imitate the indicator of a real alarm is the function of this dummy alarm project with the use of a 7555 timer IC. More >
Burglar Alarm Control Keypad
The circuit was designed to illustrate the operation of an electronic keypad to be utilized in the burglar alarm system by having five keys as the security syntax. More >
Single-Zone Automatic Burglar Alarm System
The circuit was designed to provide an alarm system against any form of burglary based on the operation of CMOS 4011 where a high output would only result when any of the input is low. More >
Switch Control with Touch-Sensitive Input
The objective of the circuit is to create touch switch control that is sensitive enough to detect the input to perform the desired output. More >
Touch Controlled Capacitive Sensor Circuit
The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system. More >
Dew-Point Sensor
Dew-point sensors are widely used in sensitive electronic equipment like cameras and copiers etc, to protect them from moisture failure by fast detection of dew. You can easily build one yourself using the readily-available dew sensor element as described here. Alternatively, you can use the tiny dew sensor element of your old VCR or video camera. More >