The PIR burglar alarm explained here will detect a human intruder within the stipulated range and sound an alarm. Thus, the system could be effectively use for detecting trespassing, theft, intrusion, … [Read more...] about PIR Burglar Alarm Circuit
Touch Operated Code Lock Switch Circuit
This touch operated electronic door lock can be used for locking any entrance through a touch keypad. The lock's touch feature is foolproof and impossible to crack since the touch function is required … [Read more...] about Touch Operated Code Lock Switch Circuit
Gadgets to Protect Women from Assaults and Harassment
Gadgets and devices that are specially designed to repel or deter a potential male offensive can be used by a girl to protect herself from a crime situation, and therefore can be very handy. In this … [Read more...] about Gadgets to Protect Women from Assaults and Harassment
Photodiode, Phototransistor – Working and Application Circuits
Photodiodes and phototransistors are semiconductor devices which have their p-n semiconductor junction exposed to light through a transparent cover, so that external light can react and force an … [Read more...] about Photodiode, Phototransistor – Working and Application Circuits
LDR Circuits and Working Principle
As the name suggests an LDR or Light Dependent Resistor is a kind of resistor that exhibit a wide range of resistance values depending on the intensity of light incident on its surface. The variation … [Read more...] about LDR Circuits and Working Principle
Anti Spy RF Detector Circuit – Wireless Bug Detector
A anti-spy or bug detector circuit is a device that detects hidden wireless electronic devices such as wireless microphones, spy cameras, Wi-Fi devices, GPS trackers or any gadget that emits some kind … [Read more...] about Anti Spy RF Detector Circuit – Wireless Bug Detector