Multidoor Opening Alarm with Indicator
This door opening alarm alerts you of intruders. You can use it for up to three doors. You simply need to fit a small...
Musical Touch Bell
Here is a musical call bell that can be operated by just bridging the gap between the touch plates with one’s fingertips. Thus there...
Visual AC Mains Voltage Indicator
You should not be surprised if someone tells you that the mains voltage fluctuation could be anywhere from 160 volts to 270 volts. Although...
Smart Cellphone Holder
This smart cellphone holder makes sure that you don’t forget to carry your mobile phone. Fitted in the car, it keeps searching for the...
Sensitive Vibration Detector
This sensitive vibration detector is realised using readily available, low cost components. One of its many applications is in a rolling shutter guard for...
Digital Counter
A counter whose logical output increments in steps on receiving clock pulses is used for a variety of counting and timing applications. It is at the heart of digital clock circuitry and other similar timing devices.
Drinking Water Supply Alarm
The State Jal Boards supply water for limited duration in a day. Time of water supply is decided by the management and the public...
Mock Alarm with Call Bell
Here is a fully automatic mock alarm to ward off any intruder to your house. The alarm becomes active at sunset and remains ‘on’...
Heat Sensitive Switch
At the heart of this heat sensitive switch is IC LM35 (IC1), which is a linear temperature sensor and linear temperature-to-voltage converter circuit.
The converter...
Laser-Guided Door Opener
This automatic door opener can be made using readily available components. The electromagnetic relay at the output of this gadget can be used to...
