Induction heating occurs very quickly. Heaters made according to this principle are used in factories to heat red-hot metal workpieces for hardening. Similar devices can be used in the home workshop. Assembling such a heater is not at all difficult, since all the components necessary for this are available for free sale.
Materials:
- Transistors C40N60 – 2 pcs. - http://alii.pub/61npji
- 10 kOhm resistors – 2 pcs. - http://alii.pub/5h6ouv
- resistors 22 kOhm – 2 pcs. - http://alii.pub/5h6ouv
- copper wire 1.2 mm;
- capacitors 0.47 µF – 3 pcs. - http://alii.pub/5n14g8
A simple induction heater circuit with just two transistors
This is a very simple self-exciting circuit. Power is supplied from a 12 V DC source. Transistors are installed on the radiator through a dielectric thermal pad. The coil contains 8 turns with a tap from the middle.
Heater manufacturing process
The first step is to tin the legs of the transistors.
Between the first and third we solder a 10 kOhm resistor. Then we bend a jumper from copper wire and solder it to the third leg.To the first one we additionally solder a 22 kOhm resistor.
Similarly, we connect resistors to the second transistor. After this you need to connect the workpieces. To do this, we solder a jumper from the first transistor to the third leg of the second.
Now using copper jumpers, solder together 3 capacitors. We solder the ends of the jumpers to the central legs of the transistors.
Next you need to solder the 22 kOhm resistors to the jumpers on the capacitors. Since they are not insulated, you need to make sure that the wires do not touch each other.
We make a spiral from the wire. In this case, 8 turns are made around the battery. The spiral is soldered to the jumpers of the capacitors.
An insulated wire must be soldered to the center of the spiral. It will connect to the “+” terminal on the batteries. The second power wire is soldered to the third leg of the first transistor.
We fix the circuit with transistors to the base. For this purpose, insulating gaskets must be used. Then we connect a 12V battery to the circuit.
Now, when metal objects are placed in a spiral, they will almost instantly heat up to high temperatures.
Naturally, an incandescent light bulb with its own spiral attached to the contact will also light up near the coil.
