In this review, we present to your attention an assembly scheme of quality Brovin or a Tesla transformer.
Let's start with the author’s video
We will need:
- winding wire;
- NPN transistor;
- 47 kΩ resistor;
- Light-emitting diode;
- a plastic or polypropylene pipe 140 mm long and 22 mm in diameter;
Winding wire can not be bought, because it is present in every charger or power supply. If you decide to remove the wire from the power supply, then note that it is wound on a "Sh" or "E" shaped transformer. One of the coils on the transformer has a thick rather short wire. The wire on the second coil is much thinner and much larger. In any case, the transformer must be disassembled to get to the wire. This can be done by tapping the case with a hammer, due to which the varnish will gradually break and the transformer will fall apart.
Next, you need to remove the layer of electrical tape on the wires and release the winding wire.
Let's start with the coil. First you need to find the length of the wire of one turn. To do this, multiply the Pi number (3.14) by the outer diameter of the pipe. If you use a pipe with a diameter of 22 mm, you get 6.9 cm.
Now take the length of the turn and multiply by the desired number of turns. In the case of the author, there will be 450 of them. As a result, we need 31 m of wire to make a coil of 450 turns on the pipe that the author uses.
Next, on the desktop, measure the distance of one meter. This is necessary to accurately mark the wire.
We wind the coil. This can be done manually, but you can also build a simple unit from a screwdriver or drill and make the winding easier.
Next, we take a 47 kΩ resistor, one LED, a coil and an NPN transistor. The author does not recommend the use of small transistors, since they do not withstand high voltages and loads. The best of all the transistors that the author used was the BD241 transistor.
Let's start the assembly of the circuit itself, which the author makes on the BreadBoard for more clarity.
The diagram shows that the plus passes through the resistor and enters the transistor, but also goes to the coil, from where it also enters the transistor. Therefore, the first thing we connect the transistor.
The transistor pinout is simple. We present it in the figure below, where B means the base, C is the collector
We connect the resistor to the base leg.
The second plus should go to the coil, which in this case is a simple wire with five turns around the wire that was wound at the beginning.We connect one end of the wire to the collector. The second end of the wire is connected to one contact from the coil.
The second contact from the coil is connected directly to the plus.
An ion lamp can be immediately thrown onto the top of the coil in order to check the circuit's performance.
The long leg of the LED is positive, and the short one is negative. We connect the plus foot to the minus, and to the second we connect a large coil or a secondary one.
At the end, we connect the LED to the resistor, and the emitter of the transistor to the minus.
The coil circuit is ready. You can safely serve food.
In case of possible malfunctions, we recommend that you first check all contacts, the correct connection of parts and the primary coil. Often, the easy change of two wires of the primary coil in some places helps.