Siren driver ic

Thanks, K. Hi, k. We want to see it and happy to you. Is it a legal issue to upload video to youtube on how to build a police sirene based on your schematic? I am struggling to build it if you have a clear HD video on the construction of the police siren please send me a link.

Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. Skip to content Posted in Sound Generator Timer. Related Posts. Tags: Alarm sounds Sirens. Apichet Garaipoom. I love electronic circuits. I will collect a lot of circuit electronics to teach my son and are useful for everyone.

Thanks for your support. View All Posts. Previous Post 16 Small digital circuit ideas for beginner. Next Post Monostable multivibrator using timer. January 23, , am. Police Bicycle Siren circuit can u give me working principle of siren light circuit. November 18, , am. December 7, , am. May 23, , pm. Police Bicycle Siren circuit is this circuit really works on bread board or not??

August 31, , am. August 31, , pm. Improved version of the self-latching loop alarm. The final point to note about the Figure 12 circuit is that n. S2 is actually an ordinary n.

Anti-tamper switches of this basic type are quite easy to make from readily-available components. Figure 13 illustrates the basic method of construction.

Basic way of constructing an anti-tamper switch see text. Such systems can be made to produce a variety of sounds, at a variety of power levels, and may be designed around various types of semiconductor devices. All siren-sound generators take the basic form shown in Figure 14 , and consist of a siren waveform generator, an output driver, and an electro-acoustic transducer. One of the cheapest and most useful semiconductor devices for use in this type of application is the CMOS B quad two-input NOR gate IC, which draws near-zero standby current, has an ultra-high input impedance, can operate over a wide range of supply-rail voltages, and can be used in a variety of waveform-generating applications.

The rest of this article shows various ways of using one or two B ICs and a few other components to make a variety of contact-operated siren-sound security circuits. Figures 15 to 17 show three different ways of using B ICs to make practical siren waveform generator circuits. Figure 15 shows the basic circuit of a simple gated Hz monotone siren waveform generator.

The generator can thus be gated on and off via the pin 1 input terminal, and produces its output signal on pin 4. Figure 16 shows a single B IC used to make a gated pulsed-tone waveform generator. Here, the two left-hand gates of the IC are wired as a gated low-frequency about 6Hz astable squarewave generator, and the two right-hand gates are wired as a gated Hz astable that is gated via the 6Hz astable.

The action of this circuit is such that it is inoperative, with its pin 11 output terminal locked high at the positive supply rail voltage when its pin 1 input terminal is high, but becomes active and produces a pulsed-tone output on pin 11 when its input pin is low at 0V. This generator can thus be gated on and off via the pin 1 input terminal and, when gated on, produces a Hz tone that is gated on and off at a 6Hz rate. The operating frequency of the 6Hz astable is controlled by R1-C1, and that of the Hz astable is controlled by R2-C2.

Figure 17 shows how the Figure 16 circuit can be modified so that it produces a warble-tone alarm signal. These two circuits are basically similar, but in the latter case the 6Hz astable is used to modulate the frequency of the right-hand astable rather than to simply pulse it on and off , thus causing the generated tone to switch alternately between Hz and Hz at a 6Hz rate.

Each of these circuits can thus be gated on and off by using any of the three input connections shown in Figure Thus, they can be gated on by closing an n. The c circuit thus gives four times more acoustic output power than either of the a or b circuits.

Thus, the simple Figure 20 driver circuit is designed to pump a maximum of only a few hundred milliwatts of audio power into a cheap 64R speaker. When the siren waveform generator is gated off, its output is high and Q1 is thus cut off, but when the generator is gated on, its output drives Q1 on and off and causes it to feed power to the 64R speaker. The output power depends on the supply rail voltage, and has a value of about mW at 12V, or mW at 6V, when feeding a 64R speaker load.

When we press the push button the capacitor finds a way to discharge through the 22k resistor which in result provides a negative voltage at the transistor that turns it on. This phenomenon creates a wailing siren because the charging and discharging of the capacitor takes time. This is the reason why the amplitude of the siren changes depending on the time of the button pressed.

That's all about building a timer based waling siren circuit. The video showing the working of the circuit is given at the end of the article. I hope you understood everything about the concept but still if you have any doubt, feel free to leave a comment below. Does wailing occur when switch is kept pressed? My finished project gave a constant hum at 80 to Hz. The frequency is controlled by the pin 5 of the IC. Kojak Siren - Here is a very simple Kojak siren that is built with two timer ICs and has 2 linear potentiometers that allows the control of sound speed and tone.

IC 2 produces a sound that can be adjusted with P2 and then drives a small speaker. The amplitude of the signal is modulated by IC 1 with a low frequency signal. This thing is LOUD! Power into the module is 3W and produces a db sound level from its 50mm diameter diaphragm. No need for mechanical rings. Mount it as a front door bell. Or mount it in your room as an alarm.

The unique small design will allow you to mount it almost anywhere. Multitone Siren - This multitone siren is useful for burglar alarms, reverse horns, etc.

The circuit is built around popular Police Car Siren - This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail. Police Electronic Siren - The sound produced imitates the rise and fall of an American police siren. Powerful Security Siren-Transistors based - This circuit was requested by several correspondents.