Electronic Siren | Electronic Project Circuits

Posts Tagged ‘electronic siren’

Two tone siren sound with IC 4093

This circuit, you can create a siren has two characteristics, the automatic is a siren. Sirens and custom. The circuit uses CMOS nand gate digital IC number IC 4093 features Quad 2-Input NAND Schmitt Trigger makes it easy to use and very diverse. This circuit can be used with speakers or amplifiers to additional offline.
Principle of the circuit is the circuit switch S2a, S2b, which will run simultaneously at work. By acting as an option that will give birth to what kind siren. If the slide switch positions on a circuit, auto siren sound generator, will be IC1a, IC1b a siren signal generator. The signal will then be extended through C6 with Q1, to drive the speakers. If you move the switch to position 2 is the circuit we need to press the switch S1 to tone siren itself, and will be IC1c, IC1d while switch S1 sound is much higher, but when we switch S1 signal. Gradually lower, the signal generator will be delivered through C6 to Q1 growth to drive speakers as well.

Be the first to comment - What do you think? Posted by admin - December 16, 2010 at 9:47 am

Categories: Alarm systems Tags: electronic siren, IC 4093, siren sound circuit

Simple Siren by 2N2907 Transistor

This be Simple Siren Circuit that build easily. Because of use the transistor 2 pcs only just. Can use 8 ohm size loudspeakers. Which , I uses old loudspeaker , at the sound doesn’t Amen! come to usable with this comfortable circuit. The usability just you presses switch (close) S1 a loudspeaker will utter. Enhance the frequency goes up (C1 , loaded ). When liberate Switch(Open)S1. The sound will decrease the frequency down (C1 , disgorge load ) change the value R1. For change the time goes up – down. Please see circuit picture assembles.

Be the first to comment - What do you think? Posted by admin - September 2, 2008 at 10:52 am

Categories: Audio diagram, home alarm systems Tags: 2N2907, Audio diagram, electronic siren, free alarm system

Emergency Siren circuit Simulates Police

This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail.
The heart of the circuit is the two transistor flasher with frequency modulation applied to the base of the first transistor. When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency descends due to the rising and falling voltage on the 22 uF capacitor. The rate of change is determined by the capacitor value and the 100k resistor from the pushbutton. The oscillation eventually stops if the button is not depressed and the current consumption drops to a tiny level so no power switch is needed.

Read more original source: http://www.techlib.com/electronics/noisemakers.html