I made my first inverter design and I got a lot of help from this website. But I want to get your suggestions before something goes wrong. Circuit output is 12V AC 72Hz square wave.
I used NE555 as frequency generator to get 12V-0V pulse signal (72Hz). When the pulse signal is high (12V) Q3 opens and output is 12V. When the pulse signal is low (0V) Q4 opens and output is -12V.
Also I don't understand why no shortcuts happen in here?
Q5 transistor converts NE555's 0V signal to 12V signal for Q4.
Also I'm sorry if you had trouble to understand it, my English is little rusty.