How do transistors receive their signal to act as a switch to convert DC to AC? Let's say in the first place we have only DC, but a transistor need AC to
![mosfet - What transistor or combination of transistors should I use to make a fully controllable AC switch? - Electrical Engineering Stack Exchange mosfet - What transistor or combination of transistors should I use to make a fully controllable AC switch? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/UXnqE.png)
mosfet - What transistor or combination of transistors should I use to make a fully controllable AC switch? - Electrical Engineering Stack Exchange
![The Bipolar Junction Transistor (BJT) as a Switch | Bipolar Junction Transistors | Electronics Textbook The Bipolar Junction Transistor (BJT) as a Switch | Bipolar Junction Transistors | Electronics Textbook](https://sub.allaboutcircuits.com/images/03075.png)