How do you create an AC current that changes directions using transistors?
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If you have two wires that you what to have AC in but you only have a battery you could do that by connecting the battery in one direction and physically rotating it so what wire the battery poles are connected do are reversed. Repeat that and you have AC from DC.
You can simplify it by having switches that change the connection direction when you flip it up and down. You need two 3 poles switches and connect them so both are switched at the same time. By continuing flipping the switch you create AC from DC
A transistor can be looked at as an electrically controlled switch. So replace the switch with four transistors and add a control signal that opens and closes them in the appropriate sequence.
You have now created AC from DC. It will be a square wave, not a sine wave but it is still AC and show the general idea.
You can look at it as a [full bridge rectifier](https://lastminuteengineers.com/the-full-wave-bridge-rectifier/) used to make DC from AC. but run in reverse. That requires diodes to be replaced by transistors and an extra control signal is needed but it is the same idea in reverse.
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