This small inverter came out in an Argentine magazine from the 1970s. It can also be assembled with the changes we made to use more modern transistors and also a transformer from 200 to 300 mA. Output current is low, but the voltage can reach more than 300 V, depending on the transformer that can have primary from 110 to 220 V or even more, as indicated in the diagram. Power can also be supplied with 6 or 9 V batteries.
