Who would have thought that the simplest inverter can be made without the use of transistors, microcircuits and complex circuits. Last time I showed how to make an inverter without transistors on a relay. As it turned out, this is not the only way to build an inverter. I will show how you can convert electrical energy from a DC voltage of 12 V to 220 V AC.
What do you need?
Step-up transformer. Naturally, it used to work as a lower, but we will use it the other way around. Such transformers can be found in receivers, electronic watches, old tape recorders.
Inverter assembly
In fact, our circuit consists of only three parts connected in series to each other. This is a transformer connected to the circuit with a low resistance winding (high resistance winding is the output of the inverter). Batteries - rechargeable batteries or batteries. And a switching element, in the role of which an electric motor will be used, which can be removed from broken children's toys.
Here is the motor itself. Just because it can not be inserted into the circuit - it will not produce switching. We need to refine it.
To do this, we disassemble the motor.
We remove the back part, before this, bending the holders.
It is necessary to modify the anchor. This consists in disconnecting one winding from the contacts. To do this, we cut off the wires of any one winding.
We collect the motor.
After such a refinement, the motor will not be able to fully spin, since one winding will be turned off. But if you run it by hand, then the motor has enough power to maintain rotation. And the absence of one winding will periodically break the power circuit between the batteries and the transformer, where the motor is connected in series.
Turn on the circuit.
We connect a multimeter to the output of the transformer. Then turn on the power. It happens that the motor starts itself, but usually not. Then we start the shaft by hand, twisting it slightly.
The inverter is working! The multimeter readings jump from zero to about 250 V. This is normal, since this is a technical inverter for powering primitive devices.
We are trying to connect the charger. Everything works fine - the phone is charging.
We connect a bulb - the lamp shines.
Of course, there is no need to talk about the quality of the converted energy, but in difficult life situations such an article may well come in handy.
