Power-faiwre-alarm
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Wailing Alarm Siren
The wailing alarm circuit diagram includes the following component parts: R1 and R5 are 4.7 kΩ resistors, R2 is a 47 kΩ resistor, R3 is a 10 kΩ resistor, R4 is a 100 kΩ resistor, and Rx is specified in...
Ac-power-line-connections-monitor
A continuous glow signifies that everything is normal; a blinking or extinguished neon bulb indicates a broken earth or ground connection, or interchanged neutral and live wires.
In electronic circuits, a neon bulb is often used as an indicator light to...
HIGH POWER SIREN
IC1a and IC1b are configured as a slow astable multivibrator, while IC1c and IC1d are set up as a fast astable multivibrator. Both configurations are of the "gated" type, allowing them to be activated or deactivated through push button PB1....
Power disconnection alarm circuit diagram
The circuit operation principle of the device illustrated in Figure 13 is as follows: When the barbed wire (Fe) remains intact, the output pin (O) of the LSE is at a high state. Consequently, the transistor (VT) remains off, and...
SIREN GENERATOR CIRCUIT
An adaptable siren generator circuit with multiple applications is presented. It is based on a 556 twin-timer chip, IC1. One timer section generates an audio tone that is directly coupled to the driver transistor, TR1. The other half of the...
Two-state-siren
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...
Simple Alarm Circuit Keeps Wandering Children
The receiver circuit in Figure 1 activates an audio alarm when the transmitter (Figure 2) moves beyond a specified perimeter. The transmitter functions as a voltage-controlled oscillator, operating at approximately 915 MHz within the unlicensed ISM (industrial/scientific/medical) band. It features...
Two-tones Siren with IC 4093
This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the circuit diagram, the typical dual-tone sound...
The alarm circuit diagram for safety box and other metal objects
When an individual touches the safety box or other protected metal objects, the sensor circuit generates a pulse to the alarm circuit. The positive edge of this pulse activates the semiconductor and thyristor flash GE, subsequently triggering the camera to...