Auto cornering beeper diagram. Car alarm - "turn off the turn signal." Installation and connection of the turn signal circuit to the on-board network

Probably all drivers have at least once forgotten to turn off the direction indicators after performing a maneuver? Standard clicks from the front panel are not always clearly audible, especially if music is playing in the cabin, so I suggest adding a simple turn signal circuit to your car with your own hands.

This “beeper” does not turn on immediately when the turn signal is turned on, but after certain time and after beeping several times, it turns off. If you accidentally forgot to turn off the turn, you will definitely react to this, and if you are stuck in a Moscow traffic jam, the sound signal will not bother you much.

The circuit is connected to the power circuit of the turn relay. When the turn signal passes, voltage appears on the relay winding, which is supplied to our circuit. At this moment, the charging of capacitance C1 begins through resistance R2. It takes about a minute to charge the capacitor. When the voltage on it reaches the level of unity, the driver on the microassembly elements D1.1-D1.2 and the passive chain C3-R3-R4 generates a pulse lasting a couple of seconds. This pulse starts the operation of the multivibrator on elements D1.3-D1.4, generating pulses with a repetition frequency of 1 kHz. And then through a transistor and a speaker in its collector circuit. A squeaky monophonic sound is heard lasting several seconds.

After turning off the turns, capacitance C1 begins to quickly discharge through resistance R1 and diode VD1. Therefore, if you turn on the turn signal again, the circuit is ready for the next cycle of operation.

The K561LA7 chip can be replaced with the domestic K176LA7 or imported CD4011 (pPD4011, MJ4011 and the like). Speaker B1 can be borrowed from an old stationary telephone set. In principle, almost any sufficiently miniature speaker of a dynamic or electromagnetic system will do. If you use a piezodynamic, the transistor switch can be excluded from the circuit, and the piezodynamic can be connected between the inputs of element D1.4 connected together and its output.

Setting up the circuit consists of setting the required intervals: by selecting resistance R2, the operating time of the turn signals without sound is set, and the value of resistor R4 regulates the duration of the sound alarm.

The turn signal beeper circuit consists of a generator based on the K561LE5 microassembly. Sound piezo emitter ZP-3. Using a tuning resistance we select the tone of the sound; The power supply diode will reliably protect the structure from possible overvoltage. The microcircuit is installed on the socket.

Size printed circuit board 20 x 22 mm. The power wires are connected parallel to the wires coming from the turn signal breaker relay connector.

For especially forgetful drivers and blondes in small red cars, I propose to assemble a circuit for a sound warning device. The device is assembled on the common and cheap K155LA3 microcircuit and is connected to the turn signal or handbrake indicator lamp in accordance with

Have you ever forgotten to turn off your turn signals after making a maneuver? Standard clicks are not always clearly audible if music is playing loudly in the cabin, so it is suggested to install an additional DIY turn signal signal.

You will need to buy the tweeter itself.

The so-called scheme The beeper consists of a K561LE5 generator. Sound piezo emitter type ZP-3 or similar. Using a trimming resistor, we select the sound tone to your taste; I set it to maximum resonant volume. The power supply diode protects against overvoltage. Microcircuit on the panel; do not forget to solder a jumper to the board under the chip.


Audio signal generator circuit

The details of the circuit may be slightly larger or slightly smaller (but small-sized):
Resistance 10 kohms - from 5 kohms to 50 kohms;
Godstroechnik 100 rooms - from 68 rooms to 500 rooms (vertical design);
Capacitor 100 mF - from 47 mF to 500 mF for a voltage of at least 16V;
Capacitor 0.1 mF - from 0.1 mF to 0.47 mF (designations 104, 154, 224, 474);
Diode - in theory, any working one will do;
piezo emitter - even from musical postcards;
The LE5 microcircuit is replaceable with LA7 from the K176, K561, K564, K164 series (I have not tested these options).

The board size is approximately 20 x 22 mm. We place the board with the emitter in a suitable box. We connect the power wires parallel to the wires coming from the turn signal breaker relay connector. I carefully pulled the terminals out of the connector, wrapped the wires, tightened them with electrical tape and then installed the terminals back into the connector. By turning on the turn signal (or emergency lights), we adjust the tone of the sound.

The device has been working reliably for about a year. Some passengers irritably note that the Gestapo used this sound to torture Soviet intelligence officers. I'm used to this sound, moreover, the beeper is clearly audible against the background of loud music in the car.

Door opening alarm.
This device is a simple multivibrator assembled from simple and affordable elements. It produces an intermittent sound signal (frequency approximately 2 kHz) with a repetition rate of approximately 4 Hz. If the doors or trunk are opened, the BF1 piezo emitter installed in the cabin under the rear seat emits an intermittent sound signal, which informs the driver that one of the doors is not closed or the trunk is not closed. To be fair, it is worth noting that foreign cars have long been using similar systems with a quiet and melodic sound.

The device does not require adjustment, and if the elements are in working order, it starts working immediately. It is connected parallel to the interior lighting lamps. The polarity of the connection does not matter, since the circuit contains a diode bridge (VD1...VD4). When the doors (hood, trunk) are opened, the light in the car interior comes on and power is supplied to the multivibrator. The circuit is operational in the voltage range from 5 to 15 V, which is quite consistent with the on-board network. By changing (within small limits) the values ​​of the chains C1-R2 and C2-R4, you can change the period and frequency of the sound signal.

Reverse warning light.
The author uses the described circuit with a slight modification to send a loud signal through the BA1 speaker when the car is moving in reverse. In this case, the circuit and dynamic head are compactly placed in the trunk near the rear panel. It is convenient to use a suitable soap dish as a housing for this circuit. The sound from the speaker is loud enough to attract the attention of passers-by to a car moving in reverse at a distance of up to 20 m.

Turn signal.
This scheme beeps when the turn signals are turned on. Often (especially on older car models) the driver forgets to turn off the turn signal after completing the maneuver, which leads to a tense situation on the road for other road users.

In this circuit, the BF1 emitter will signal that the turn signal is on. A simple audio frequency generator is assembled on two elements DD1.1 and DD1.2 of the DD1 microcircuit. Pin 7 of the DD1 chip is connected to the ground of the car. Points “a” and “b” of the diagram are connected to the wires of the turn switch in the steering column housing. You need to look for them empirically or by electrical diagram car. The resistance of the BF1 emitter winding must be at least 1600 Ohms so as not to create an excessive load on the output of the DD1.2 logic element. The circuit and emitter are located under the dashboard of the car.


Many drivers forget to turn off the turn signal after passing through an intersection, misleading other drivers. To prevent this from happening, I put together a homemade product that duplicates the operation of the turn signals with an audible signal. Here is a homemade diagram


The circuit is very simple, consisting of a sound generator consisting of two transistors, two capacitors, one resistor and a TK-67 or TA-56m telephone capsule at 50 ohms. To do this we will need the following materials and tools:


1-Transistors MP-25, MP-37, resistor MLT-0.25 W with a resistance of 1 kohm, electrolytic capacitor with a capacity of 5 microfarads 25 V, capacitor MBM with a capacity of 0.05 microfarads, telephone capsule TA-56m 50 ohm, switch. 2-soldering iron, solder, rosin, tweezers, wire cutters, circuit board with petals from any old TV, installation wires.

We collect as follows:

Step 1 - Check the radio components with a multimeter


To do this, set the device to measure resistances of 2000 ohms, connect the black probe of the device to the base of the MP-25 transistor, and the red one to the collector, the device should have a resistance of about 170 ohms.


Next, we connect the black probe to the base, and the red one to the emitter, on the device too - 170 ohms.


Now we swap the probes, the device should show – 1.


We measure the resistance between the emitter and the collector - on device -1.

We also check the transistor MP-37 in the same way, in this case the red probe goes to the base, the black probe goes to the collector, and then to the emitter; the device should read about 170 ohms. We swap the probes - it shows -1. K-E resistance – 1.

We check the resistance of the resistor, as shown in the photo.


We also check the capacitors and telephone capsule.

Step 2 - solder the parts onto the circuit board, first solder the jumpers between the petals from the wires. Then we solder the capacitors and resistor, and after that we solder the transistors and then the switch and capsule.

Step 3


We check the functionality of the homemade product by connecting + 12V power to it from the power supply or car battery. The generated signal must be audible in the telephone capsule.

Step 4 - place the homemade product in any suitable case, at your discretion. This is not shown in the photo. Next, install the homemade product in the car. With a minimum of parts, there is great benefit for the driver.

Novice motorists sometimes forget to turn off the turn signal after completing the maneuver, which can confuse other road users. A homemade sound turn signal repeater, which you can make with your own hands in 10 minutes, can help in solving this issue. A simple one will come to the aid of lovers of homemade products for cars. diagram of a homemade sound duplicator (repeater) of rotation on the K561ln2 microcircuit and “boozer” without a built-in generator.

I’ll tell you right away why I didn’t use a regular buzzer with a built-in generator - I didn’t like the sound tone. Therefore, I first connected the buzzer to an existing low-frequency generator, turned the knob, chose the most pleasant sound and reproduced it using the generator on the k561ln2 chip.

The entire turn signal repeater circuit can be divided into 2 parts:

  • The generator is made on 2 logical elements INV1 and INV2 as well as a time-setting RC circuit
  • The amplifier is made of 3 logical elements INV3 INV4 INV5 connected in parallel in order to amplify the switched current. The amplifier allows the generator to operate with loads such as a “buser”.

Frequency adjustment (setting the turn signal tone) made by changing the nominal value of R1 and C1 .

Installation and connection of the turn signal circuit to the on-board network.

The “-” circuit is connected to the vehicle ground, and the “+” is supplied through “decoupling” diodes from the emergency stop button. To determine which terminals of the button to connect to, take a multimeter and set it to measurement mode DC voltage, turn on the left turn - find at which terminal + 12V appears and disappears cyclically, do the same with the left turn turned on.

In my case, the circuit was assembled using the surface-mounted method. As a housing for the sound duplicator of turns, a 2-ml syringe was chosen from which the piston was removed. The wire was taken out of the spout hole, and the buzzer was glued with hot glue to the pad on the opposite side. As you can see, in 10 minutes you can make your own sound duplicator of turns using a logic chip and a pair of attachments