Siren Sound Circuit | Electronic Project Circuits

Posts Tagged ‘siren sound circuit’

Cheap siren with nand gate IC

This is a siren sound generator circuit. Which is less expensive and can create simple. The IC1 is using CD4011 (Digital Nand Gate) and the IC2 is CD4046.
Operation of the circuit, IC1 is a clock frequency 1 Hz.(Frequency adjusted by the value of R1 and C1.) Then it pluse IC1 regtifier through diode D1 to charge slowly with the C2 control of R3.
Then the C2 signal sends to IC2 at pin 9 (Control voltage input). For IC2, which acts VCD (Voltage Conrolled Oscillator).The frequency of the output voltage control. The frequency is changed by voltage and out to the speakers. The VR1 is the resistance adjustment and C3 affect the mean frequency of the circuit.If you turn off the switch S2 is not a siren sound, but it is another voice. And use of CMOS circuits to make very low watts of power, but also be useful in combination with other controls.

Be the first to comment - What do you think? Posted by admin - May 13, 2011 at 8:52 pm

Categories: Alarm systems, Audio diagram, Digital Tags: cmos digital ic, siren sound circuit

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

Electronic Siren by IC Digital

With this circuit we can create a altered sound of siren. The oscillator IC1a-b is constituted by two gates NAND, oscillating in very low frequency. This oscillation drive the IC2, that is a electronic switch, which opens and closes in the rythm of oscillation. When closes the switch then the voltage of supply charge the capacitor C3 through the resistance R2. When switch IC2 opens, the C3 discharge through the R3. The voltage with which is charge the C3, regulates the VCO of IC3, that is PLL, so that we have in the exit his one altered sound. You can experiment with the prices of resistances and capacitors in order to you change the sound of siren. The R1, C1 check the time of operation, the R4, C2 check the frequency of produced sound and the R3, C3 check the change of sound.

Source : http://users.otenet.gr/~athsam/electronic_siren.htm
Sam Electronic Circuits 10/01