Sound scheme of the car's direction indicators on transistors. Sound doubler of turns - do it yourself

Open door signaling device.

The basis of the circuit is the simplest multivibrator, assembled on transistors VT1 and VT2. Transistor VT3 is an amplifier stage, the load of which is the emitter BF1, the resistance of which can range from 50 to 1600 ohms. The voltage to power the signaling device is taken from the diode bridge, which is connected to the car interior lighting lamp. The alarm circuit is shown in Figure 1.

The circuit does not need adjustments and adjustments, if the parts are in good working order, it works right away. Using a diode bridge to power the signaling device allows you not to worry about the correct polarity of the connection. The signaling device is operational with a wide range of supply voltage from 5 to 15 volts. By selecting the capacitance C1 and the resistor R2, as well as C2 and R4, you can change the tone of the sound and the period of its interruption.

Thus, when the door or trunk is opened, when the interior lamp of the car comes on, the signaling device will emit a not too loud intermittent signal.

By making a slight revision of the above-described scheme, i.e. replace the transistor VT3 KT315B with KT603B, and instead of the head of the emitter BF1 put a small speaker BA1, this device may well serve as a signaling device for the car's movement in reverse. The dimensions of the circuit make it possible to mount the device in any compact plastic box. For example, a case for a soap dish, or something similar, will do and fix it in the area of the rear bumper near the lights by connecting two wires: one to the central contact of the reversing lamp, this is a white lamp in the block, and the second screw to the car body, this will be negative the wire. The revision scheme is shown in Figure 2.

The volume of the sound turns out to be quite enough to attract the attention of pedestrians, it is clearly audible at a distance from the car up to 15 ... 20 meters.

It is often possible to see on the roads when an unattentive driver, with a faulty switch return device, after completing a maneuver, forgets to turn off the turn signal and continues to drive with flashing signals until he comes to his senses or starts to make the next maneuver. Naturally, this situation not only misleads the rest of the drivers, but can also lead to more serious consequences. A simple device that emits a sound signal when turning in any direction will help to get rid of such inattention. The diagram is shown in the following figure.

A conventional audio frequency generator is assembled on the DD1 microcircuit, the seventh leg of which is connected to any point of the car body, i.e. to ground, and the inputs, indicated on the diagram by points "a" and "b", go to the steering column to the turn signal switch. The radiator winding BF1 has a resistance of at least 1600 ohms, so as not to create an excessive load on the output logic element DD1.2.

Reverse movement warning device. (Option 2)

Consider another version of the vehicle reverse motion signaling device (diagram below).

As you can see in the diagram, the signaling device represents two generators connected in series. Both generators are assembled on one K561LN2 microcircuit. The first generator generates rectangular pulses that control the second generator. When a high level signal is present at the output of the first oscillator with a duration of 0.45 seconds, the second oscillator does not work. At a low signal level at the output of the first generator (duration 0.55 seconds), the second generates rectangular pulses, the frequency of which is 400 hertz. At the output of the second generator there is a transistor VT1, it amplifies the current output signal, and its load is a dynamic head. To select the desired sound tone, you can change the value of the capacitance C2. Increasing the value of this capacitor will increase the tone produced by the alarm. The duty cycle depends on the nominal capacity C1, i.e. audio interruption time.

The printed circuit board is made of one-sided foil-coated fiberglass (image below the diagram). After manufacturing, the board is placed in a box of a suitable size (plastic can be used), and for greater resistance to dirt and moisture, the board can be filled with paraffin, or the lid of the box can be put on a sealant.

The connection is the same as in the previous version of the indicator, to the reversing lamp.

Drivers often forget to turn off the turn signals. Therefore, I propose to collect and put there an additional signal that will be heard and inform you that the turn signal is working. The scheme of the device is based on a generator built on a K561LE5 microcircuit.

Characteristics of K561LE5:

Supply voltage - from 3 to 15 V.
Consumption current - no more than 5 mka.
Low level output voltage - 3 V.
The high level output voltage is 7.5 V.
Low level output current is 0.6 mA.
The high level output current is 0.3mA.
Temperature range - from -45 to +85 ° C.

A 3P-3 was taken as a sound piezo emitter, but analogs are also suitable. We adjust the volume and tone of the signal with a variable resistor; in my case, the maximum resonance of the volume was set.

The circuit has protection against reverse polarity; for this purpose, a diode is installed at the positive input of the power supply. Almost all fixed diodes (1N4002, 1N4003, 1N4007) will work.

Sound signal generator circuit

List of radio components

A resistor with a nominal value of 10kOhm (5kOhm-50kOhm are also suitable).
Trimmer resistor with a nominal value of 100kOhm (68kOhm-500kOhm are also suitable).
Capacitor 100μF (suitable from 47μF to 500μF with a voltage of at least 16volts).
Capacitor 0.1 microfarad (suitable from 0.1 microfarad to 0.47 microfarad).
Any diode.
Piezo emitter -3p-3.
Chip K561LE5. LE5 can be replaced with LA7.

The size of the board is approximately 20x22mm. Place the board with the piezoelectric emitter in the case. We connect the power wires in parallel with the wires coming from the relay connector (turn signal breaker).

And so, carefully pull out the terminals from the connector, wind the wires, insulate and put the terminals back in their place. Also, turn on the turn signal and use the trimmer to adjust the volume and tone of the sound. And also the signal is clearly audible against the background of loud music in the car.

That's all, good luck!

Many drivers forget to turn off the turn signal after passing an intersection, misleading other drivers. To prevent this from happening, I assembled a homemade product that duplicates the work of the direction indicators with a sound signal. Here is a homemade diagram

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

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

We collect as follows:

Step 1- Check the radio parts with a multimeter

To do this, we put 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 have - 1.

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

In the same way, we check the MP-37 transistor, in this case the red probe is on the base, the black one is on the collector, and then on the emitter, the device should be about 170 ohms. We swap the probes - shows -1. Resistance K-E - 1.

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

We also check the capacitors and the telephone capsule.

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

Step 3

We check the performance of the homemade product by connecting it to + 12V power from the power supply or auto-accumulator. The generated signal should be heard in the telephone capsule.

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

Novice motorists sometimes forget to turn off the direction indicator after completing a maneuver, which can mislead other road users. A home-made sound repeater of turns can help in solving this issue, which can be done by hand in 10 minutes. A simple one will come to the aid of lovers of homemade products for a car circuit of a homemade sound duplicator (repeater) of a turn on a k561ln2 microcircuit and "buzer" without a built-in generator.

I'll make a reservation right away why I didn't use a regular buser with a built-in generator - I didn't like the tone of the sound. Therefore, I first connected the boozer to the available bass generator, twisted the knob, chose the most pleasant sound and reproduced it using a generator on a k561ln2 microcircuit.

The whole circuit of the bend repeater can be divided into 2 parts:

Generator - it is made on 2 logical elements INV1 and INV2 as well as the time setting RC-circuit
The amplifier is made on 3 logical elements INV3 INV4 INV5 connected in parallel in order to amplify the switched current. The amplifier allows the generator to handle loads such as a boozer.

Frequency control (setting the tone of the bend repeater) made by changing the value of R1 and C1 .

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

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

In my case, the circuit was assembled using the surface mounting method. A 2 ml syringe from which the plunger was removed was chosen as a housing for the sound duplicator of turns. The wire was pulled out of the spout hole, and the boozer was glued with hot glue to the site on the opposite side. As you can see, in 10 minutes you can make a sound duplicator of turns on a logic chip and a pair of hinged elements with your own hands

Sometimes drivers, especially beginners, forget to turn off the turn signal after completing a maneuver. Regular clicks are sometimes not audible if the music is playing loudly. A do-it-yourself sound repeater of 12 v turns will help to correct the situation. Instructions for making a tweeter yourself is attached in this article.

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Purpose of the sound repeater of turns

In cars, as a rule, they began to install turn signal switches, which, after completing the maneuver, automatically return to the neutral position. This has its advantages: no need to be distracted by turning off the turn signals when the turn is complete, no need to waste time checking if the signal is off. Over time, the automatic return of the switch may refuse (video by Alexander Baranov).

On some vehicles, the switch does not automatically return to its original position. In this case, it is necessary to independently monitor its disconnection after the end of the turn. When clicks are heard, but sometimes due to loud music or noise, they are not heard.

If you do not turn off the turn signals in time, this can cause an emergency on the road, as it confuses other road users.

By setting the sound notification of the switch relay operation, the problem of the forgotten turning off of turns can be solved.

Instructions for making tweeters for turn signals

You can make an audible turn signal for your car with your own hands within 15 minutes, without contacting a car service about this. To create such a duplicate of the turn signals, a K561LN2 microcircuit is required, it will serve as the basis. In addition, a boozer is needed, but without a built-in generator.

You can take a boozer, which has a built-in generator, if you are satisfied with its sound. In this case, an example of connecting a boozer to a standard low-frequency generator is analyzed. Having connected to the bass generator, you should turn the tuning knob and select the most suitable sound. Now you can reproduce it using the K561LN2 microcircuit and a generator as a basis.

The device diagram can be represented in two parts:

The generator is assembled from two logical elements INV1 and INV2, to which a timing RC circuit is connected.
The amplifier consists of three parallel logic elements INV3, INV4, INV5. They are connected in parallel to amplify the switched current. Thanks to the amplifier, the generator can operate with a load in the form of a boozer.

The tone of the sound repeater is adjusted by changing the value of C1 and R1. When the device is connected, the negative pole is attached to the vehicle ground, and the positive pole is taken from the stop by means of decoupling diodes.

To determine the button terminals, you should use a multimeter. On it, you need to select a mode for measuring DC voltage. Having turned on the left turn signal, you need to look at which terminal the +12 Volt voltage periodically appears. Similar actions must be performed by turning on the right turn signal.

In this case, the device is mounted on a surface. A 2 mm syringe with a piston removed from it is used for the housing of the sound repeater of turns. The wire is removed from a narrow hole - the syringe nose, and the buser is attached to the back of the syringe with hot glue.

Thus, it is easy to assemble an audio turn signal repeater with your own hands using a microcircuit and 5 logic elements. At the same time, you can save time and money on visiting a car service.