Three sirens in one Circuit
#siren
#alarm
#sound generator
#security
#emergency
#audio
#warning signal
#noise maker
#alert system
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Audio Graphic Equaliser
Cleaned Input:
Description: Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. I didn't design this one but it's really very simple. The details shown...
Automatic Turn-Off Alarm With Delay
In this circuit, IC1A and IC1B serve as a monostable multivibrator. Any input from the sensors SI through S5 triggers IC1A to produce a logic low signal, which activates IC1B, turning on Q1 until the capacitor C3 discharges through resistor...
Door handle alarm
The automatic door handle alarm circuit emits an audible alarm and activates an LED when someone touches the door handle. This latching circuit continues to produce sound until it is manually turned off. Transistor Q1 is configured as an astable...
Bass and Tremble Controller
It is very useful for 1 -100 watt AUDIO AMPLIFIERS
This description refers to a component or circuit designed to enhance the performance of audio amplifiers in the power range of 1 to 100 watts. Such amplifiers are commonly used in...
Siren uses TTL gates
The siren comprises two oscillators that generate tones. A third oscillator is utilized to alternately switch the others on and off, creating a two-tone effect. By adjusting the capacitor values, different tones can be produced.
The siren circuit is designed to...
THREE FREQUENCY AUDIO OSCILLATOR
The complete circuit diagram for the audio sine-wave generator is presented. Resistors R1 and R2 provide biasing to the non-inverting (pin 3) input of IC1, and their parallel resistance constitutes one component of the Wien network. They correspond to R1...
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...
Siren Alarm Circuit
The ramp voltage from the low-frequency oscillator IC1 modulates IC2, thereby producing a rising and falling tone similar to the wail of police cars.
The described circuit utilizes a low-frequency oscillator (IC1) to generate a ramp voltage. This ramp voltage serves...
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...