Flashing LED. How to make a flashing lamp. The simplest LED flasher. Flashing LED on one battery

Flashing LEDs are often used in various signal circuits. Light emitting diodes (LEDs) of various colors have been on sale for quite a long time, which blink periodically when connected to a power source. No additional parts are needed to make them blink. A miniature integrated circuit that controls its operation is mounted inside such an LED. However, for a novice radio amateur it is much more interesting to make a flashing LED with your own hands, and at the same time study the principle of operation of an electronic circuit, in particular flashers, and master the skills of working with a soldering iron.

It's not always that easy, but it can be done. While each has its place, sometimes it's nice to have a cheaper, less expensive alternative. Our good old friend is blinking an incandescent light bulb. The flashing light has a bimetallic strip inside, when it gets hot enough, it turns off the circuit until it cools down.

Our flashing light bulb is a replacement for many Christmas lights. This gives an output current ranging from 150 to 250 mA, depending on the freshness of the battery and the resistance of the lamp. To try it out, we created a pattern on a piece of perforated paper. The light bulb wasn't very interested in soldering, but eventually got done. After soldering all two components, he is ready to try.

How to make an LED flasher with your own hands

There are many schemes that can be used to make an LED blink. Flashing devices can be made either from individual radio components or based on various microcircuits. First, we will look at the multivibrator flasher circuit using two transistors. The most common parts are suitable for its assembly. They can be purchased at a radio parts store or “obtained” from obsolete televisions, radios and other radio equipment. Also in many online stores you can buy kits of parts for assembling similar circuits of LED flashers.

But this madness is ineffective! Like other incandescent light bulbs, it is an efficient resistor that appears to release a small portion of its energy as visible light. However, this is not exactly a high-performance circuit. Prices dropped sharply, looks became somewhat standardized, and blackout versions became common.

Hundreds of millions sold worldwide suggest they deliver largely what is expected. What's not to like when prices keep falling? Because if a consumer installed a higher wattage incandescent bulb than recommended, "bad things" can happen in the fixture. Fixture manufacturers learned early on that if there is a socket, many consumers assume that it is good for any lamp that is not explicitly warned about.

The figure shows a multivibrator flasher circuit consisting of only nine parts. To assemble it you will need:

• two resistors of 6.8 – 15 kOhm;
• two resistors with a resistance of 470 - 680 Ohms;
• two low-power transistors with an n-p-n structure, for example KT315 B;
• two electrolytic capacitors with a capacity of 47–100 μF
• one low-power LED of any color, for example red.

It is not necessary that paired parts, for example resistors R2 and R3, have the same value. A small spread in values ​​has virtually no effect on the operation of the multivibrator. Also, this LED flasher circuit is not critical to the supply voltage. It works confidently in the voltage range from 3 to 12 volts.

Flashing LED on one battery

This is not true at all for the 40 or 60 watt equivalent. The fact that it has a metal body has nothing to do with restricted air. The same deal holds true for competitive light bulbs. Place it in any type of base socket and it gets much hotter and all the life expectancy metrics are broken. Place it in any kind of porch or post-light and it can fry, with its internal power components at the edge of a cliff. Place the lamp in a fully enclosed ceiling mount and set a timer for when failure occurs.

The multivibrator flasher circuit works as follows. At the moment of supplying power to the circuit, one of the transistors will always be open a little more than the other. The reason could be, for example, a slightly higher current transfer coefficient. Let transistor T2 initially open more. Then the charging current of capacitor C1 will flow through its base and resistor R1. Transistor T2 will be in the open state and its collector current will flow through R4. There will be a low voltage on the positive plate of capacitor C2, connected to the collector T2, and it will not charge. As C1 charges, the base current T2 will decrease and the collector voltage will increase. At some point, this voltage will become such that the charging current of capacitor C2 will flow and transistor T3 will begin to open. C1 will begin to discharge through transistor T3 and resistor R2. The voltage drop across R2 will reliably close T2. At this time, current will flow through the open transistor T3 and resistor R1 and LED1 will light up. In the future, charge-discharge cycles of capacitors will be repeated alternately.

New lighting technologies, that is, the most energy-efficient lamps, had to have lower sensitivity than incandescent lamps in the face of voltage fluctuations in the power supply - one of the most significant disruptions. As you have seen, this statement is not always true, and there are even times when the sensitivity is greater than that of traditional incandescent lamps.

Normal LED flashes

The International Electrical Engineering Commission has set legal limits on mains fluctuations, taking as an answer the response of the incandescent lamp in front of it. “Industry that installs this type of equipment must ensure that it does not degrade the quality of the electrical supply and does not comply with these restrictions,” the researcher adds.

If you look at the oscillograms on the collectors of the transistors, they will look like rectangular pulses.

When the width (duration) of rectangular pulses is equal to the distance between them, then the signal is said to have a meander shape. By taking oscillograms from the collectors of both transistors at the same time, you can see that they are always in antiphase. The duration of the pulses and the time between their repetitions directly depend on the products R2C2 and R3C1. By changing the ratio of products, you can change the duration and frequency of LED flashes.

Based on these results, various international standards organizations have begun to propose changes in this aspect. Two changes were suggested: adjusting the flickering indicators to the new warning lights or increasing the set limit. But both changes bring with them a bit of a problem: on the one hand, “today there is not a single type of reference lamp”, and on the other hand, by increasing the limit, these types of fluctuations can affect another type of equipment connected to the network.

“To analyze the validity of these proposals, a comprehensive study of the response of new lighting technologies to voltage fluctuations is necessary,” says Askaret. And it was after completing the analysis that they noticed that not in all cases the new technologies were less sensitive.

To assemble the blinking LED circuit, you will need a soldering iron, solder and flux. As a flux, you can use rosin or liquid soldering flux, sold in stores. Before assembling the structure, it is necessary to thoroughly clean and tin the terminals of the radio components. The terminals of the transistors and the LED must be connected in accordance with their purpose. It is also necessary to observe the polarity of connection of electrolytic capacitors. The markings and pin assignments of KT315 transistors are shown in the photo.

They carried out measurements using a set of lamps against different types of voltage fluctuations. First, they used standardized fluctuations, and in the second paper they used real fluctuations, which are generally more complex, recorded at four locations in northern Spain. They concluded that there are three different behaviors: on the one hand, there are lamps that show lower sensitivity than an incandescent lamp; others, on the other hand, have reached or even surpassed levels of schism; and others experienced different responses depending on the actual cue applied.

Flashing LED on one battery

Most LEDs operate at voltages above 1.5 volts. Therefore, they cannot be lit in a simple way from one AA battery. However, there are LED flasher circuits that allow you to overcome this difficulty. One of these is shown below.

These results call into question the lower sensitivity of new technologies to voltage fluctuations and show that the sensitivity does not depend only on the lighting technology, but also on the complexity of voltage fluctuations and the actual scenario in which the lamp is used, the researcher concludes. “So he adds that the proposal to raise flicker limits and the search for a new reference lamp does not seem viable.”

The solution can be focused on controlling the response of lamps during the design process. To do this, it is necessary that the lamp is no more sensitive than an incandescent lamp, he emphasizes. That is, upon completion of the investigation, maintaining the current flicker threshold, a test protocol must be established by which each manufacturer can verify that the lamp does not exceed the threshold under these conditions.

In the LED flasher circuit there are two chains of capacitor charging: R1C1R2 and R3C2R2. The charging time of capacitor C1 is much longer than the charging time of capacitor C2. After charging C1, both transistors open and capacitor C2 is connected in series with the battery. Through transistor T2, the total voltage of the battery and capacitor is applied to the LED. The LED lights up. After the discharge of capacitors C1 and C2, the transistors close and a new cycle of charging the capacitors begins. This LED flasher circuit is called a voltage boost circuit.

Blinkers are fun to watch and also provide colorful lighting in the evenings and during the holiday season. You can use as many lights as you want in your flasher, but each one must be greater than 110 volts when using power. This type of lights gives the effect of movement as the individual bulbs turn on and off sequentially. This means that only a certain number of lights are working at any given time. The number of work lamps must be equal to or greater than 110 volts, otherwise the fuse will blow.

We looked at several LED flashing light circuits. By assembling these and other devices, you can not only learn how to solder and read electronic circuits. As a result, you can get fully functional devices useful in everyday life. The matter is limited only by the imagination of the creator. With some ingenuity, you can, for example, make an LED flasher into a refrigerator door open alarm or a bicycle turn signal. Make the eyes of a soft toy blink.

Allow a few extra meters to connect the wire to the power source. 2 Divide the measured length into equal parts so that you can touch the lights. This is the distance between each lamp. 3 Calculate the voltage at which each lamp should be. Divide the number of lights by 3; this roughly corresponds to the number of lights that will be lit at the same time. Divide the result by 110 to get the voltage of each light. Using the example from the previous step, if you are using 36 lamps, divide 36 by 3 to get 12, then divide 110 by 12 to get 9, round the result to the nearest whole number. In this example, each lamp would need to use 10 volts. 4 Buy from a specialized store the number of lamps you need at the previously calculated voltage. Be sure to purchase sockets for each one and that the terminal connections are covered. You don't need any exposed wire. 5 Mark the wire with a pen a few dozen inches from the end, then place marks at equal distances depending on the number of lamps you place on the wire. Following the same example, you will end up with two long wires at each end and 35 5cm strips. 7 Remove less than 6mm of plastic from the end of each wire strip using cleaner. This part can be a little tedious, but once you're done, you'll be able to keep an eye on connecting the flasher lights. 8 Remove the socket covers so you can access the terminations. Loosen the two screws of each terminal using a screwdriver. 9 Insert one end of the long wire into the end of the first connector, then tighten the screws. It doesn't matter which termination you connect to. Connect one end of the small strip of wire to the other end in the first socket, then connect the other end to the socket in the second socket. 10 Repeat the process of connecting all the short strips of wire in series to the ends of the sockets until you reach the last one. Attach another long wire to the remaining terminal of the last connector. 11 Replace the slot covers. Make sure the wires are secure when replacing each cover and make sure there is no exposed wire. 12 Connect the opposite end of one of the long wires to the control unit. Remove the cover using a screwdriver and then unscrew the donut screws from the stop. Remove 6mm of plastic from both ends. Attach one end of the bare wire to the other end of the flasher control. Replace the cover and replace the screw to secure it. 14 Remove the cover from the 3 amp fuse. Loosen the screws at both ends. One is a small and annoying connector, the other is a larger and annoying connector. Attach the end of the wire that is connected to the control box to the larger connector and tighten the screw. Connect the wire from the opposite end of the light chain to the smaller connector and tighten the screw. You want them close enough to get the best effect. . In versions with two lights, they flash alternately, one off and the other on.

If you don’t have the opportunity to buy a ready-made flashing LED, where the necessary elements are built into the bulb to perform the desired function (all that remains is to connect the battery), you can try to assemble your own circuit. You will need little: calculate the LED resistor, which together with the capacitor sets the oscillation period in the circuit, limit the current, select the type of switch. For some reason, the country's economy is driven by the mining industry; electronics are buried deep in the ground. I'm strained with the element base. It may indeed be a problem, not a task, to make a blinking LED. The “blue buckets” campaign is looming on the horizon.

Get list of materials

When did you go shopping for light bulbs? Later, in this tutorial, the easiest and clearest way to create a flashing LED circuit will be explained to you. To build a circuit like the one mentioned above, some important components are needed, so be sure to take the time and patience to cut them out. However, you need to know that to continue your creativity you need to have a welder, if you don't have one then you must buy one before you continue.

Follow the circuit diagram

For example, you can print it and use it for a project. In the drawing, you should know that the positive pole is shown in red and the negative pole is shown in black. Depending on the flash speed you want to recreate, you may want to insert a different capacitor. To give you a better idea, we offer you two practical examples: With one of 10uF you will get a "very fast" LED light flash. We suggest for an optimal final result and to recreate the slightly irritating effect on the eyes, use a capacitor of 300 µF.

LED operating principle

When connecting an LED, learn a minimum of theory - the VashTechnic portal is ready to help. The region of the pn junction, due to the existence of hole and electronic conductivity, forms a zone of energy levels unusual for the thickness of the main crystal. By recombining, charge carriers release energy; if the value is equal to a quantum of light, the junction of the two materials begins to radiate. The hue is determined by certain quantities, the relationship is as follows:

E = h c / λ; h = 6.6 x 10-34 is Planck’s constant, c = 3 x 108 is the speed of light, the Greek letter lambda denotes wavelength (m).

From the statement it follows: a diode can be created where the difference in energy levels is. This is how LEDs are made. Depending on the difference in levels, the color is blue, red, green. Rare LEDs have the same efficiency. The blue ones, which historically appeared last, are considered weak. The efficiency of LEDs is relatively low (for semiconductor technology), rarely reaching 45%. The specific conversion of electrical energy into useful light energy is simply amazing. Each Watt of energy produces 6-7 times more photons than an incandescent filament under equivalent consumption conditions. Explains why LEDs have a strong position in lighting technology today.

Creating a flasher based on semiconductor elements is incomparably simpler. Relatively low voltages are enough, the circuit will start working. The rest comes down to the correct selection of key and passive elements to create a sawtooth or pulse voltage of the desired configuration:

1. Amplitude.
2. Duty factor.
3. Repetition frequency.

Obviously, connecting an LED to a 230 volt network would be a bad idea. There are similar circuits, but it’s difficult to make it blink; the element base is missing. LEDs operate from much lower supply voltages. The most accessible are:

• +5 V voltage is present in chargers for telephone batteries, iPads and other gadgets. True, the output current is small, and it is not necessary. In addition, +5 V can be found on the power supply bus of a personal computer. We will eliminate the problem with current limitation. The wire is red, look for ground on black.
• Voltage +7…+9 Found on chargers of hand-held radios, commonly called walkie-talkies. There are a great many companies, each with standards. Here we are powerless to give specific recommendations. Walkie-talkies are more likely to fail due to the nature of their use; extra chargers can usually be obtained relatively cheaply.
• The LED connection circuit will work better from +12 volts. Standard microelectronics voltage, found in many places. The computer unit contains a voltage of -12 volts. The core insulation is blue, the wire itself is left for compatibility with older drives. In our case, it may be necessary if you don’t have a +12 volt power supply element at hand. It is difficult to find complementary transistors and switch them on instead of the original ones. The values ​​of the passive elements remain. The LED is turned on by the reverse side.
• At first glance, the -3.3 volt rating seems unclaimed. If you are lucky enough to get SMD0603 RGB LEDs on Aliexpress for 4 rubles each, you won’t have to move mountains. However! The voltage drop in the forward direction does not exceed 3 volts (reverse switching is not required, but in case of incorrect polarity the maximum voltage is 5).

The design of the LED is clear, the combustion conditions are known, let's start implementing the idea. Let's make the element blink.

Testing flashing RGB LEDs

A computer power supply is an ideal option for testing SMD0603 LEDs. You just need to install a resistive divider. According to the technical documentation diagram, the resistance of p-n junctions in the forward direction is assessed, with the help of a tester. Direct measurement is not possible here. Let's put together the diagram shown below:

The +3.3 V wire of the computer power supply is orange insulated, we take the circuit ground from the black one. Please note: it is dangerous to turn on the module without load. Ideal to connect a DVD drive or other device. If you have the ability to handle live devices, it is permissible to remove the side cover, remove the necessary contacts from there, and do not remove the power supply. The connection of LEDs is illustrated by the diagram. Have you measured the resistance on the parallel connection of LEDs and stopped?

Let us explain: in working condition, you will need to turn on several LEDs; let’s do a similar setup. The supply voltage on the chip will be 2.5 volts. Please note that the LEDs are flashing and the readings are inaccurate. The maximum should not exceed 2.5 volts. Indication of successful operation of the circuit is expressed by blinking LEDs. To make the part flicker, remove the power from unnecessary ones. It is possible to assemble a debugging circuit with three variable resistors - one in a branch of each color.

You need to take significant values, and don’t forget: we will significantly limit the current flowing through the LEDs. In fact, you need to think through the question according to the situation.

Normal LED flashes

Flashing LED circuit

The circuit shown in the figure uses avalanche breakdown of the transistor to operate. KT315B, used as a key, has a maximum reverse voltage between the collector and base of 20 volts. There is little danger in such inclusion. For the KT315Zh modification, the parameter is 15 volts, much closer to the selected supply voltage of +12 volts. A transistor should not be used.

Avalanche breakdown abnormal mode of p-n junction. Due to the excess of the reverse voltage between the collector and the base, atoms are ionized by impacts of accelerated charge carriers. A mass of free charged particles is formed, carried away by the field. Eyewitnesses claim: for the breakdown of the KT315 transistor, a reverse voltage applied between the collector and emitter with an amplitude of 8-9 V is required.

A few words about the operation of the circuit. At the initial moment of time, the capacitor begins to charge. Connected to +12 volts, the rest of the circuit is broken - the transistor switch is closed. Gradually, the potential difference increases and reaches the avalanche breakdown voltage of the transistor. The capacitor voltage drops sharply, two open p-n junctions are connected in parallel:

1. The transistor is in breakdown mode.
2. The LED is open due to direct switching.

In total, the voltage will be about 1 volt, the capacitor begins to discharge through the open p-n junctions, only the voltage drops below 7-8 volts, and the valve ends. The transistor switch is closed, the process is repeated again. The circuit is inherent in hysteresis. The transistor opens at a higher voltage than it closes. Due to the inertia of processes. You can watch how the LED works.

The values ​​of the resistor and capacitance determine the oscillation period. The capacitor can be taken much smaller by connecting a small resistance between the transistor collector and the LED. For example, 50 Ohm. The discharge constant will increase sharply, and it will be easier to check the LED visually (the burning time will increase). It is clear that the current should not be too large; the maximum values ​​are taken from reference books. It is not recommended to connect LED lamps due to the low thermal stability of the system and the presence of abnormal transistor mode. We would like to say goodbye to the readers of the VashTekhnik portal; we hope the review turned out to be interesting, the pictures are intelligible, the explanations are as clear as God’s day.

This 12-volt LED flasher allows you to create the effect of chaotic flashes of each of the 6 LEDs. The operating principle is based on avalanche breakdown of the p-n junction.

Description of LED flasher operation

Let us describe the operation of the circuit on one block; the remaining five work on a similar principle. When supply voltage is applied through resistor R1, capacitor C1 begins to charge and therefore the voltage across it begins to increase. While it is charging, nothing happens.

After the voltage at the terminals of the capacitor reaches 11...12 volts, an avalanche breakdown of the p-n junction of the transistor occurs, its conductivity increases and, as a result, the LED begins to glow due to the energy of the discharging capacitor C1.

When the voltage across the capacitor drops below 9...10 volts, the transistor junction closes and the whole process repeats from the beginning. The remaining five blocks of the circuit also operate at approximately the same frequency, but the actual frequency is slightly different from each other due to the tolerances of the radio components.

You can use arbitrary radio components in the design. It should be noted that if the supply voltage is less than 12 volts, the circuit will not work, since avalanche breakdown of the transistor will not occur and the generator will not work. A special feature of this type of generator is its dependence on the supply voltage. The higher the voltage, the higher the oscillation frequency. The upper power level is limited by the characteristics of capacitors and current-limiting resistors.

The values ​​of resistors and capacitors determine the operating frequency of each individual generator. Resistors protect transistors from destruction during an avalanche breakdown. The resistance of the resistors should not be greatly underestimated, as this can lead to failure of the transistors. The same thing can happen if the capacitor capacitances are increased too much. In this case, it is advisable to connect additional resistance in series with the LED.

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We present to your attention probably the simplest, but most interesting LED flasher circuit. If you have a small Christmas tree made of shiny rain, then a bright 5-7 cd LED mounted in its base that not only lights up, but also blinks is a very simple and beautiful decoration for your workplace. The power supply of the circuit is 3-12 V, can be replaced by power from the USB port. The previous article was also about an LED flasher, but unlike it, this article will talk about a single LED flasher, which in no way narrows its scope, I would say even the opposite. Surely you have seen a winking green, red or blue light more than once, for example, in car alarm. Now you have the opportunity to assemble a simple LED flasher circuit. Below is a table with the parameters of the parts in the circuit for determining the flash frequency.

In addition to this application, you can use the LED flasher as a car alarm emulator. Installing a new car alarm is not a simple and troublesome task, but having the specified parts on hand can be quickly assembled LED flasher circuit and now your car is “protected” for the first time. At least from accidental hacking. Such a “car alarm” - an LED flashing in the crack of the dashboard will scare off inexperienced burglars, because this is the first sign of a working alarm? You never know where else you will need a flashing LED.

The frequency with which the LED lights up depends on the resistance of resistors R1 and R2 and the capacitance of capacitor C1. At the time of debugging, instead of resistors R1 and R2, you can use variable resistors of the corresponding values. To slightly simplify the selection of elements, the table below shows the ratings of the parts and the corresponding flash frequency.

If a flasher on an LED refuses to work at certain values, you must first of all pay attention to resistor R1, its resistance may be too low, and also to resistor R2, its resistance may be too high. The duration of the pulses themselves depends on resistor R2, and the duration of the pause between pulses depends on resistor R1.

The LED flasher circuit with minor modifications can become sound pulse generator. To do this, you will need to install a speaker with a resistance of up to 4 ohms in place of resistor R3. Replace LED HL1 with a jumper. Use a transistor of sufficient power as transistor VT2. In addition, it is necessary to select capacitor C1 of the required capacity. The choice is made as follows. Let's say we have elements with parameters from row 2 of the table. Pulse frequency 1Hz (60 pulses per minute). And we want to get sound with a frequency of 1000Hz. Therefore, it is necessary to reduce the capacitance of the capacitor by 1000 times. We get 10 µF / 1000 = 0.01 µF = 10 nF. In addition, you can play with decreasing the resistance of the resistors, but don’t get too carried away, you can burn the transistors.

One of our regular readers, especially for our site, suggested another option for a very simple LED flasher. Watch the video:

It is recommended to start learning the basics of electronics by assembling simple and clear circuits, so the flashing light circuit in various designs and options is ideal for beginning radio amateurs on their difficult journey. In addition, these designs can be useful in everyday use. For example, as festive light decorations or as a dummy alarm system.

An elementary circuit of a flasher with six LEDs, the peculiarity of which is its simplicity and the absence of active control elements, such as transistors, thyristors or microcircuits.

With the third flashing red LED, two ordinary red LEDs 1 and 2 are connected in series. When flashing 3 flashes, 1 and 2 light up along with it. In this case, the opening diode bypasses the green LEDs 4-6, which then go out. When the flashing light goes out, LEDs 1 and 2 go out along with it, and the group of green LEDs 4-6 lights up.

This LED blinking control circuit allows you to create a random flashing effect. The operating principle is based on avalanche transition breakdown.

When turned on, capacitance C1 begins to charge through resistance R1 and therefore the voltage across it begins to increase. While the capacitor is charging, nothing changes. As soon as the voltage reaches 12 volts, an avalanche breakdown of the p-n junction of the semiconductor device occurs, its conductivity increases and therefore the LED begins to burn due to the energy of the discharging C1.

When the voltage across the capacitor drops below 9 volts, the transistor closes and the whole process repeats from the very beginning. The other five blocks of the circuit work on a similar principle.

The resistance and capacitor ratings determine the operating frequency of each individual generator. Resistances, in addition, protect transistors from failure during an avalanche breakdown.

The easiest way to assemble a flashing design is to use a specialized LM3909 chip, which is quite easy to get.

It is enough to connect the frequency-setting circuit to the microassembly, supply power and, of course, the LED itself. Here you have a ready-made device for simulating an alarm system in a car.

At the indicated values, the blinking frequency will be about 2.5 Hertz

A distinctive feature of this design is the ability to adjust the blinking frequency using trimmers R1 and R3.

Voltage can be supplied from any voltage or from batteries, the range of use is as wide as your imagination.

In this design, it is used as a generator and periodically opens and closes the field-effect transistor. Well, the transistor turns on chains of ordinary LEDs.

The first and second chains of LEDs are connected in parallel and receive power through resistance R4 and the field-effect transistor channel.

The third and fourth chains are connected via diode VD1. When the transistor is locked, the third and fourth circuits light up. If it is open, then the first and second sections light up.

The flashing LED is connected through resistors R1, R2, R3. During its flash, the field-effect transistor opens. All parts, except the battery, are installed on a printed circuit board.

Quite simple amateur radio designs can be obtained if you use ordinary ones. True, one should remember about their operating features, namely, that they open when a certain voltage level is applied to the control electrode, and to close them, the anode current must be reduced to a value less than the holding current.

The design consists of a short pulse generator using a field-effect transistor VT1 and two stages using thyristors. An EL1 incandescent lamp is connected to the anode circuit of one of them.

At the initial moment after turning on the power, both thyristors are closed and the lamp does not light. The generator creates short pulses at intervals depending on the R1C1 chain. The first pulse arriving at the control electrodes opens them, lighting the lamp.

Current will flow through the lamp, VS2 will remain open, and VS1 will close because its anode current, set by resistance R2, is too small. Capacitance C2 begins to charge through R2 and by the time the second pulse is formed it will already be charged. This pulse will unlock VS1, and the output of capacitor C2 will briefly connect to the cathode VS2 and close it, the lamp will go out. As soon as C2 is discharged, both thyristors will be locked. The next pulse of the generator will lead to a repetition of the process. Thus, the incandescent light bulb flashes at a frequency that is half the set frequency of the generator.

The basis of the design is a simple multivibrator with two transistors. They can be almost anything, as long as the conductivity is required.

I connect the power from the size through a resistance, the second wire is ground. I mounted the LEDs in the sockets from the speedometer and tachometer.