cheap bicycle alarm schematics circuit

If you are considering building the Desert Ratt 2, it is advisable to read all the accompanying text, as it contains relevant construction details. Engaging with the comments and replies can also provide additional insights, as previous blog posts have...

Battery Powered Night Lamp circuit

This circuit functions as a night lamp when a wall mains socket is unavailable for plugging in a continuously operating small neon lamp device. To minimize battery consumption, it utilizes a single 1.5V cell, and a simple voltage doubler drives...

Battery-powered fence charger

The circuit is fundamentally an auto ignition coil paired with a set of points that perform a similar function. It employs a pulsing circuit constructed from a single CMOS NOR integrated circuit (U1) to open and close relay contacts, thereby...

Elderly lost alarm circuit

The circuit utilizes an RMIB multivibrator component that operates at a maximum distance. When the distance exceeds a specific threshold, the output pin of the receiver goes low, effectively stopping the oscillation. The NE555 multivibrator, which is part of the...

Mobile Phone Battery Charger

A small and portable unit that can be assembled on a veroboard. Mobile phone chargers available in the market are quite expensive. The circuit presented here comes... The described circuit is a compact and cost-effective mobile phone charger designed for assembly...

Battery-powered-ground-noise-probe

Oscilloscope measurements of ground noise can be unreliable because noise can enter your circuit via the scope's three-pronged power plug. This issue can be mitigated by utilizing the ground-noise tester described. The circuit operates on two 9-V batteries and only...

Sensor-Activated Relay Pulser Circuit

A sensor activates transistor Q1 to turn on the low-frequency 555 oscillator, which generates pulses to control LAMP II. The sensor may respond to variations in light or temperature. Either resistor RA or RB can function as the sensor, depending...

electronic hotel door vulnerability using stealth lock circuit

The term "pentester" refers to a penetration tester, individuals who assess security vulnerabilities. Many high-end hotels globally depend on keycard locks for securing hotel rooms. However, recent incidents of theft have shown that these locks may not be as secure...

Locker Guard Locker Security Alarm Circuit Anti Theft

Locker Guard Circuit Diagram. This compact circuit is designed to protect a locker or almirah from burglary. If the locker is opened while in the armed state, the circuit triggers a loud police siren to deter the burglary attempt. The Locker...