Motorcycle AlarmCircuit circuit

This is a two-state or on/off-type siren where the LM13080 oscillates at an audio frequency and drives an 8-ohm speaker. The LM339 acts as a switch that controls the audio burst rate. The described circuit utilizes the LM13080 integrated circuit, which...

The motorcycle anti-theft alarm (4)

The motorcycle anti-theft alarm described in this article utilizes a proprietary displacement sensor. It is characterized by high sensitivity, good reliability, a low false alarm rate, and ease of construction. The principle of the circuit involves an integrated vibration displacement...

Wailing Alarm Siren

This alarm siren circuit produces a continuous frequency sweep, resulting in a warbling sound. The duration of the warbling is approximately 6 seconds, with 3 seconds allocated for frequency sweeping upward and 3 seconds for sweeping downward. The alarm siren circuit...

Siren Circuit

An LM380 audio IC is configured as a feedback audio oscillator. A transistor astable modulates this oscillator at a low frequency, which produces a siren tone. The circuit utilizes the LM380, a power audio amplifier IC, which is configured to operate...

Wireless Switch Circuit PCB

The circuit diagram presented is a highly sensitive wireless relay switch designed to control home appliances such as flush systems and hand dryers. This wireless switch operates without the need for a remote control. It functions by simply moving a...

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project is designed for a custom-made battery casing that provides ample space for concealing components. The switch can be adapted for various projects but is specifically tailored to meet e-bike requirements. It utilizes a clever thyristor functionality to create...

Fridge Door Alarm Circuit

Emits a beep if the door remains open for more than 20 seconds. This circuit is housed in a compact enclosure and is positioned in the refrigerator near the lamp or the opening. The described circuit functions as a door alarm...

Wireless remote control switch circuit 5

The wireless remote control transmitter circuit consists of control buttons S1 to S16, resistors R1 to R3, a capacitor C1, a regulator diode VS, a crystal oscillator BC1, and DTMF encoder integrated circuits IC1 and IC2. The circuit components are...

Two HiJack Alarms

The first circuit was designed for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few minutes delay - when...