DO IT YOURSELF SIMPLE INVERT WITHOUT TRANSISTORS DO IT YOURSELF

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You need only two components to assemble a simple inverter that converts DC 12 V to 220 V AC.

Absolutely no expensive or scarce items or parts. Everything can be collected in 5 minutes! You don’t even need to solder! Twisted wire and all.

What is needed for an inverter?

Transformer from the receiver, tape recorder, center, etc. One winding network 220 V, the other 12 V.
Relays for 12 V. Such a lot are used where.
Wires to connect.
Light bulb load.

Inverter assembly

It all comes down to connecting the relay and transformer as follows. First of all, we load the load in the form of an LED bulb on the transformer network winding - this will be the inverter output.
Then we connect the low-voltage winding in parallel with the relay. Now one contact goes to power to the battery, and the second is connected to another contact of the battery, but only through a closed relay contact. Plus or minus does not matter.

All! Your inverter is ready! Super easy!
We connect to the battery - it is in our role as a 12 V source and the 220 V lamp starts to glow. In this case, you hear the squeak of the relay.

How does this inverter work?

Everything is very simple: when you connect the power, all the voltage goes through the closed contacts on the relay. The relay trips and the contacts open. As a result, the relay power is turned off and it brings the contacts back to closed. As a result, the cycle repeats. And since a step-up transformer is connected in parallel with the relay, powerful pulses of constant on-off are supplied to it and converted into alternating high-voltage current. The frequency of such a converter ranges from 60-70 Hz.
Of course, such an inverter is not durable - sooner or later the relay will fail, but it’s not a pity - it costs a penny or even free if you take the old one. And the output voltage according to the nature of the current and the spread is just awful. But this simple converter can help you out in any serious situation.