DIY Browin Kacher

Among radio amateurs, a very interesting device called the Brovin Kacher is very popular. With its help one can observe spectacular corona discharges, lightnings, plasma arcs. Many people on the Internet call the tesla coil as a kacher, but these are two completely different devices with different operating principles. In this article, we will focus on the quality of Brovin, perhaps the simplest high-voltage device that you can think of.

Scheme of quality Brovin

The circuit is extremely simple, it contains only one transistor, a pair of resistors and a pair of capacitors. Capacitors serve to filter the supply voltage, one of them must be electrolytic with a large capacitance (470-2200 μF), and the second ceramic or film with a small capacitance (0.1-1 μF), to smooth out high-frequency interference. Two resistors form a voltage divider, one of them should have a small resistance (150-200 Ohms), and the second - about 10-20 times more. At the same time, a trimming resistor can be supplied in series with the high-resistance resistor in order to adjust the caster to the maximum discharge length. On the printed circuit board attached to the article, an installation place is provided for it. The transistor in the circuit can use almost any powerful n-p-n structure. The transistors KT805, KT808, KT809 have proven themselves well. You can also experiment with the field and put, for example, IRF630, IRF740. The length of the discharges largely depends on the choice of a transistor. The transistor must be installed on the radiator, because a large amount of heat is released on it. L1 in the diagram is the primary coil, and L2 is the secondary coil, a high-voltage discharge is removed from it.

Device board

The fee is performed by the LUT method, the file for printing is attached. To connect the power wires and the terminals of the coils, terminal boards are provided on the board.
Download board:

Manufacturing a secondary (high voltage) coil

First of all, you need to make a secondary coil. With her, everything is simple and specific - the more turns, the greater the voltage, respectively, longer than the discharges. You can use enameled copper wire with a cross section of 0.1 - 0.3 mm. It is very convenient to use a sewer pipe as a frame for the secondary winding, the optimal diameter is 5-7 cm. You need to wind the wire round to round, as accurately as possible. It is advisable to use a single piece of wire so that there are no joints. But if in the process the wire was torn - it's okay, you can solder a torn piece to it, carefully insulate it and continue to wind the coils, it will work anyway.
To speed up the winding process, you can install the pipe on two supports on the left and right so that it rotates freely on them. At the same time, winding the wire will be much easier. If in the process of work there is a need to leave, the tip of the wire can be fixed with tape, then it will be possible to return, unstick the tape and continue to wind. In no case do you need to release the tip of the wire, otherwise the tension will disappear, the turns will separate and you will have to start all over again.
After the coil is wound, the turns of wire must be fixed on the pipe. It is best to use a transparent varnish, then the coil will look very beautiful. I coated the coils with ordinary wax, he coped with his task, now accidentally damaging a thin wire will be much more difficult.
A solder wire should be soldered to the lower end of the wire and carefully fixed at the edge of the pipe.
At the upper edge of the pipe is the so-called "terminal" - the place from which the corona discharge will "come". It is advisable to make it sharp, then the discharge will be concentrated on the tip of the needle. He fixed the bolt on the edge of the pipe, and screwed the dart tip onto the bolt, as seen in the photo. The secondary coil is ready.

Primary Coil Fabrication

The primary coil contains 2-5 turns of thick copper wire with a cross section of 1.5 - 2.5 mm. It should be located around the secondary coil, its diameter should be 2-3 cm larger. For the frame of the primary coil, you can use, again, a sewer plastic pipe, you just need to take a piece of pipe with a diameter and a length greater than for the secondary. At a distance of 10 cm from the top of the pipe, two holes are drilled through which a copper wire is threaded. The discharge length strongly depends on the number of turns, so their number is selected experimentally.
The wire from the turns themselves must be brought to the bottom of the coil, passing them inside the pipe. Be sure to fix it with glue. The primary coil is ready.

Build quality Brovin

After the coils are wound, you can assemble everything together. Two round pieces with holes in the center are cut from the foam. The secondary coil should fit tightly into the central hole, and the outer diameter of the workpieces should correspond to the diameter of the primary coil.
We place round billets inside a large pipe, and then we poke a secondary coil into them. If necessary, fix them with glue. The wire from the secondary coil must be routed to the bottom of the large pipe.
Two holes are drilled in the lower part of the large pipe, one under the power connector, the second under the toggle switch.
Now it remains only to connect the board to the power supply, putting a toggle switch into the gap of the positive wire, and connect the leads of the coils.
When all the wires are connected, you can check the operation of the device. Gently apply voltage to the board. If a small discharge has appeared on the terminal, it means the kacher is working. If the kacher refuses to work even with an increase in the supply voltage, the leads of the primary coil should be interchanged. Now you can experiment with the number of turns in the primary coil, move the coils relative to each other, finding a position at which the discharge will be maximum. The power supply voltage range is very wide - a small discharge appears already at 12 volts. With increasing voltage, it increases, along with it, the heat release on the transistor also increases. Therefore, it is necessary to monitor the temperature of the radiator, because an overheated transistor will not work for a long time.
In the last turn, it remains only to install a board with a radiator inside a large pipe, in the lower part of it, put a toggle switch with a connector in the already drilled holes.
Such a kater looks very impressive even when turned off. You can touch the corona discharge with your finger, it is quite safe, because the current from such a discharge flows along the surface of the skin without penetrating inside. This effect is called the skin effect, it occurs due to the high frequency of the quality. During long-term operation, a large amount of ozone is released, therefore, the kacher should be turned on only in ventilated rooms. Also, do not forget about the strong electromagnetic radiation that is created around the device. It is able to disable other electronic devices, so you should not leave phones, cameras, tablets nearby. The created electromagnetic field is so strong that gas-discharge (or, more simply, energy-saving) bulbs are ignited by themselves near the coil.

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