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.
The circuit presented in this article is very easy to repeat and should not cause any difficulties in assembly.
It can be used in various devices for sound notification. For example, an alarm system, sound duplication of a turn signal in a car or bicycle, a low battery signal, and so on. You can, of course, take a ready-made beeper, for example, from an old Chinese alarm clock, musical card or other devices, but I decided to make it myself with my own hands. It's more interesting that way.
Another goal of the assembly is to popularize youth’s passion for radio electronics. If this site can captivate at least a few people with such an interesting and good cause, then its task can be considered completed.
I took a simple, but proven scheme. I don’t even remember where I got it from.
Piezo sound emitter circuit
Parts for assembling the horn circuit
Parts for the circuit can be used in a very wide range.For example, La7 microcircuits from the K176, K164, K564, K561 or K561LE5 series or imported analogues. In order not to solder and desolder the microcircuit, it is best to take a special contact pad and solder it into the circuit (it costs pennies), and replacing the microcircuit will take seconds, and during soldering there is no risk that the microcircuit will overheat or be damaged by static electricity. In addition, you can easily experience different brands microcircuits for performance.
Capacitor C1 is polar with a voltage of at least 15 volts and a capacity of 47 to 500 microfarads. If you want the buzzer to immediately stop after turning off the power, then this capacitor must be excluded, otherwise after turning off the power, the sound continues until the capacitor is discharged.
Ceramic capacitor C2 from 0.1 to 0.47 microfarads. They are designated by numbers on the cover - 104, 154, 224, 474.
Resistor R1 from 5 to 50 kilo Ohms. Any power, but less is better. So that the dimensions are not large.
Potentiometer R2 from 68 to 500 kilo Ohms. The power is the same, less.
You can use any diode you like. It is used to protect the chip from improper power connections. You can do without it altogether.
Sound emitter ZP-3 or any similar.
How to connect ZP-3? If the sound emitter ZP-3 is new, then you need to solder wires to it, as in the photo. Soldering is easy if you use flux. We solder one wire to the membrane. Solder the second wire to either of the two terminals.
The supply voltage of the circuit is 12 volts. This could be a battery, rectifier or any other DC source.
The sound tone of the device depends on the values of the circuit elements, so you can experiment by changing capacitors and resistors to achieve a sound that you like.
In order not to make a printed circuit board, it is best to take and use a breadboard; it turns out much easier and faster.
We place the parts more tightly on the breadboard, solder them, check them again and test the sound by connecting them to a power source.
With proper assembly and serviceable parts, the circuit starts working immediately and does not require adjustment. If you don’t like the tone, then adjust the potentiometer to your taste.
The signaling device is assembled.
Sound control of the turn signal
V.ZAKHARENKO, UA4HRV,
Samara.
Since the last century, it has become a rule in cars to install a turn switch with automatic return to the neutral position. This, of course, is convenient: you don’t need to be distracted by turning it off after making a turn and you don’t have to constantly check if it was accidentally turned on.
But sooner or later, the automatic return fails. I have to drive without it for a while. Quite quickly you become convinced that this is not so bad during complex maneuvers, but you must constantly remember about the “turn signal”. Installing an audible alarm for the operation of the turn relay will help solve the problem. It is not difficult to install such a device into a car. The proposed modification scheme is applicable not only to electronic relays (usually such relays have three outputs), but also to old thermomechanical ones (they have only two outputs).
In my "ten" I did it this way. I opened the relay block (in the "ten" it is located under the dashboard on the driver's side) and took out the turn signal relay. For each of the three relay terminals, I made three extension cords (about 5 cm each) from a pin and a “socket” for car connectors. When sealing the wires into two sockets, I added one more wire about 20 cm long. I connected a miniature 12 V sound emitter to these wires. I inserted the pins into the sockets of the turn relay on the panel, and put the sockets on the corresponding relay terminals so that the connection diagram of the the relay has not changed. The difference is that a sound emitter is connected in parallel (Fig. 1). That's all the modification. When driving in winter (with the windows closed), the sound emitter located behind the dashboard is clearly audible. In summer (the windows are open), there is more noise in the cabin, and it is better to place the sound emitter in any niche of the dashboard.
Miniature sound emitter combined with a generator audio frequency, used, for example, in alarm clocks or washing machines like a beep. A sound emitter is available in the form of a tablet (Fig. 2) with an operating voltage of 6, 9, 12 or 15 V. If you do not have a ready-made sound emitter, you can make it yourself using any known scheme (for example, shown in Fig. 3). An experienced radio amateur will be able to make a sound emitter even with a volume control.
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When the car is moving in heavy traffic and when the driver makes various maneuvers, direction indicators are of no small importance. Many novice drivers are often simply lost, forgetting that after completing the next maneuver they need to turn off the turn signal. By doing this, they (unconsciously) provoke other participants in the movement.
A homemade sound doubler for turns is designed to prevent such a misunderstanding, which, by the way, can be assembled in just... 10 minutes. And here the K561LN2 microcircuit will be an important help to the car enthusiast. Its main differences are low power consumption and good performance.
It is immediately necessary to make a reservation why in this case I did not use a standard buzzer, which contains a built-in generator. It just doesn't have a very pleasant sounding tone. Therefore, it is first advisable to connect the buzzer to the input of the low-frequency generator, then use the tuning knob to select the appropriate sound at the output. And only after that let the sound pass through the microcircuit.
The device circuit consists of two separate parts.
The generator contains two logical elements, as well as a small timing circuit.
The amplifier consists of three logic elements paralleled with each other. Such a connection significantly increases the strength of the switched current. The amplifier enables stable operation of the microcircuit generator with “buser” type loads.
Installation and connection of the device.
The negative pole (minus) is attached, as usual, to the vehicle ground. The positive pole (plus), through “decoupling” diodes, is taken from the emergency stop button.
To figure out which terminal of this button corresponds to which turn signal, you need to use a multimeter turned on to measure DC voltage. Then, turning on the turn signal (for example, the left one), make sure that +12 volts periodically appears and disappears at one of the terminals. Do the same with the other turn signal.
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 - sound signal It won't bother you too 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
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