Cell Phone Detector aka Mobile Bug
#cell phone detector
#mobile bug
#RF detection
#wireless signal
#security
#surveillance
#frequency detection
#electronic sensor
#signal detector
#telecommunication
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Home Security System
This alarm circuit activates when switches S1 through S5 are engaged. This action illuminates LED1 and triggers transistor Q1 through integrated circuits IC1C and IC1D. Relay RY1 is configured for self-latching. Switch S10 is utilized for resetting the circuit. When...
Electronic Locker Guard
Protect your locker or briefcase from theft using this pocket-sized gadget. It emits a loud police siren to attract attention. The circuit utilizes a single integrated circuit (IC).
This circuit is designed to provide a compact and effective security solution for...
Security-door-ajar-alarm
The TL3019 device activates, or goes low, when a south pole of a magnet approaches the chip face. In this example, there are five doors, each equipped with a magnet embedded in its edge, with the south pole facing outward....
Key Code Combination High Security Door Lock
This project involves an electronic lock that supports numerous combinations, which can be easily modified. It unlocks only with the correct sequence of four consecutive numbers. A significant feature of this electronic lock is that the four numbers must be...
Digital-frequency-window
This circuit detects frequency variations that exceed preset limits. IC1 functions as a binary counter connected to the clock frequency (FcLK). The outputs from IC1 are compared with preset values set by IC2 and IC3. The input signal, which must...
Security alarm
This alarm features both open-loop and closed-loop detection systems along with an automatic alarm shutoff mechanism. It provides a 15-second delay for exit and entrance. Additionally, the alarm activation time can be adjusted from 1 to 15 minutes.
The alarm system...
Detecting and locating RF bugs
A previous post discussed a phone bug, and this document presents an application note regarding a circuit designed for detecting and locating radio frequency transmitters. This design concept illustrates a circuit capable of identifying RF "bugs," including concealed wireless cameras,...
Midnight Security Light Circuit Schematic
Most thefts occur after midnight when individuals enter the second phase of sleep known as 'paradoxical sleep.' Here is an energy-saving circuit that causes...
An energy-saving circuit designed for security applications can be particularly beneficial during the late-night hours when individuals...
Surveillance Transmitter Detector
The site features several low-power transmitters, but until now, there has been no receiver. This circuit can be utilized to scan an area or room, indicating whether a surveillance device is active. The challenge in creating an effective detector lies...