Homemade quack horn. Police quack (siren) on a PIC microcontroller. Schematic diagram of a siren with a power amplifier
The microcircuits were replaced, and the reason why they burned out was also found out - if you turn on the device for a few seconds, the microcircuits will boil, the fact is that they are placed on a common heat sink with a small area.
The heatsink was also replaced with a larger one. A typical bridge circuit for connecting amplifiers on the TDA2003 chip is shown below.
2 ohm resistors can be replaced with homemade ones. To do this, take the paste from a helium pen and wind 20 turns of wire with a diameter of 0.5 millimeters on it, turn to turn. You can wind it in two rows to make the resistor compact. All polar capacitors used in the circuit are selected with a voltage of 16 or 25 volts.
The power for the amplifier is supplied through a relay, but it can be excluded from the circuit, since here you can use a direct connection with wires, the currents are not so large that the wires cannot withstand.
The capacitance of the input capacitor can be deflected in one direction or another; this will not affect the operation of the amplifier and sound parameters in any way, since the amplifier works as a signal repeater. The load of the head, which is connected to an 8 ohm amplifier. It is known that the microcircuit can operate at a load of 2 ohms, with a bridge connection of 4 ohms; to increase the volume, you can use a small transformer (iron) with two windings. The primary must be connected to the amplifier output. The primary winding should have a resistance of 3.2-4 ohms, wound with a wire of 0.7-1 mm. We wind the secondary winding with the same wire and it should have the same resistance as the first. This way you can increase the power by 1.5-2 times. Author - Arthur Kasyan (AKA).
Greetings, dear car enthusiasts and radio enthusiasts! It was sometime in February. A friend of mine, whom I have known for most of my life, asked me to build a Quack. The main conditions were: low price, power supply from 12 Volts, the presence of at least one siren and, in fact, the “crack” function itself.
After a little searching for the circuit diagrams of these “quacks”, it turned out that it would be possible to assemble a useful device only on a microcontroller. I settled on a circuit with a PIC16F628A microcontroller. Until this moment, I was not familiar with microcontrollers, and so I had to read a little about them.
After reading a little about them, I realized that I would have to assemble a programmer and I chose the simplest JDM programmer, which consisted of only a few parts, namely a board, four resistors, a 5-volt stabilizer, a COM port connector, a 6F22 battery, and the actual microcontroller.
The programmer is extremely simple and therefore it took me literally 10 minutes to make it (not counting making the board).
Programmer circuit:
Ready programmer:
I hid all the “stuffing” of the programmer under electrical tape. This programmer can program PIC microcontrollers in DIP8, DIP14, DIP18 packages.
I programmed the microcontroller using the WinPic800 program. If suddenly someone’s programmer doesn’t work the first time (like me), then check whether your COM port is enabled in the BIOS settings.
Quack diagram:
Photo of the finished device:
The diagram contains almost no details. In addition to the MK, 2 33pF capacitors and 4 MHz quartz are important in it, and the rest is essentially not so important. Sound effects are activated by shorting the corresponding contacts to ground.
The “bare” circuit produces too weak a signal, and therefore it was decided to make an amplifier. We considered options such as TDA2003, TDA2005, TDA7294, TDA7265 and even a transistor amplifier, in the end it was decided to build an amplifier using TDA7265.
The amplifier is switched on as a “bridge” and, according to the chip developers, produces as much as 50 watts of power. The amplifier circuit was taken from the datasheet, changed quite a bit, and replaced the 1 µF electrolytes with film. And here is the diagram itself:
The amplifier turned out to be quite good, especially since I wasn’t chasing Hi-Fi, since it’s not needed here. According to measurements, the peak output power was about 40 watts.
I had a board lying around from some speakers for a PC and it just fit this chip, so I broke out the required piece and put the chip and all its few accessories there. The microcircuit does not require a small radiator.
Photo of the finished amplifier:
After assembling the amplifier, I thought about how to power the whole thing from 12 volts? The quack is okay, it requires only 5 volts, but the amplifier needs bipolar power supply +/- 20 volts. It was decided to make a converter using the well-known TL494 chip. It was done according to this scheme:
But I changed the circuit a little, namely, I lowered the power supply capacitors from 4 to one 2200 μF 25V and instead of 4 field-effect transistors, I installed 2.
It is advisable to use a 2-watt R13, as it gets a little hot. The converter is turned on by supplying “+” power to the “REM” contact.
The transformer is W-shaped without a gap, the primary winding is 5+5 turns, the secondary winding is 7+7 turns and 4 turns for powering the MK. Instead of IRF3205, IRFZ44 and the like are quite suitable.
Photo of the finished converter:
The converter turned out to be quite good and its power is quite enough to power the amplifier. Everything was placed in a metal case and covered with cardboard. The control panel was placed in a plastic case.
Photos of the finished “Quack”:
When you press the "Start" button, the "Wail" siren starts; when you press the "Start" button again, the siren changes to "Yelp", in the mode of which you can press "End", which is also launched once when there is no siren. All sirens are interrupted by a quack - the "AirHorn" signal. The Stop button stops all sounds instantly. 
My development board looks like this. 
The siren is generated by the PIC16F628A microcontroller with 220 µs pulses. The project in proeus looks like this. 
I didn't make the printed circuit board, I'll leave it up to your discretion. The amplifier for this siren can be successfully used from my
There is also a version on PIC12F629. There is a "Wail" blueprint on board. It is turned on and off with one “Siren” button, which is also interrupted by a crack when you press the “Crack” key. The connection diagram is similar, only 2 control buttons are added. In Proteus it looks like this. 
The result was an option at 629/675 peak, all three sirens without using quartz. In Proteus it looks like this. 
Paying attention: do not overwrite the calibration constant when programming
The result was a version based on PIC16F84A, the pins were reassigned. Don't forget to pull the reset pin to the power supply.
Quartz at 4 MHz 
To sound children's toys, motorcycles and battery-powered cars, I suggest you make a simple circuit of a sound device that simulates the signal of a “Police siren”. The circuit is simple, contains a small number of parts and does not require configuration. It is not difficult to assemble; you can order stitched microcontrollers using the link at the end of the article.
The siren device is assembled on a programmable microcontroller PIC16F628.
The firmware has two different sirens and a “Quack”.
Schematic diagram of a siren with a power amplifier
Printed circuit board for siren with PA
How to use a siren?
When you press the “Quack” button, a one-time imitation of the “Police Quack” is activated. When you press the “Start” button, “Siren No. 1” turns on, when you press it again, “Siren No. 2” turns on. There is also an effect that simulates the end of the sound of the first siren; to turn on this effect, click the “End” button. To stop playing a sound effect, press the Stop button. This circuit is easy to assemble and does not require configuration.
“UM” – Power amplifier, circuit above. This circuit is assembled on a printed circuit board; there is also a simple stabilizer on the printed circuit board to power the microcontroller.
The buttons for this device were taken from the panel of an old car radio, but simple tact buttons can also be used.
You will also need a PIC programmer. There are many different programmer schemes on the Internet.
A USB or COM port is usually used for data transfer.
You can buy a ready-made programmer that you need inexpensively in China.
Modification: “Quack with flashing light”
If you wish, you can also add an LED flasher on the PIC12F675 to the “quack” circuit!
Photo of the assembled board with a flasher
Video of a siren and flasher working
If you want to assemble the proposed siren with a flasher, you can purchase a kit for its assembly with stitched microcircuits at the link: vsmaster.ru
Sergey V. Kamyshin. (For all questions: [email protected])
P O P U L A R N O E:
Cars often have two horns installed, resulting in a two-voice sound - both sound at the same time. One signal is a high tone with a sound frequency of about 430 Hz, the other is a low tone with a frequency of about 320 Hz.
But when the horns sound alternately, the car signal contrasts sharply with the background of similar ones. Previously we looked at a similar scheme:
There is another option...
Before starting the article, I want to warn you that the use of such signaling devices is illegal, at best you will face a hefty fine. VIP signals have always been considered a luxury item and there are many car enthusiasts who would like to have such a device in their car. This is a device that generates powerful low-frequency sound signals.
The signal consists of three main parts.
1) Control panel - in new models, very often the entire generator circuit is located in the control panel. Models such as the right have only one MK, which is programmed and has several operating modes.
2) Power amplifier - Amplifies the signal and supplies it to the emitter
3) Emitter - a loudspeaker that is designed to reproduce a signal.
The generator produces sawtooth pulses and feeds them to the pre-amplifier, then the signal from the pre-amplifier goes to the main power amplifier, in our case this amplifier is made using a cheap TDA2003 monophonic microcircuit.
The circuit has a matching transformer; the signal from the UMZCH goes to the primary winding of this transformer. The secondary windings of the transformer are connected to the bases of powerful key transistors. The signal forces the transistors to open, the latter supply voltage to the primary winding of a more powerful (power) transformer.
At the output of this transformer we already receive an amplified rectangular signal, which is fed to the loudspeaker.
The generator (imitation of a quack) is built on a two-channel pulse generator and counter-dividers. To simulate the sound of a siren, the circuit has a separate microcircuit.
The design diagram is available in the full archive, the download link for which you can find at the end of the article (download is free).
Loading...