DC to AC inverter using 555 timer

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mfecky
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I want to know the function of the two power amplifier ?
 
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What circuit are you referring to?
 
https://www.physicsforums.com/showthread.php?t=510472
 
I attached the circuit in this link

https://www.physicsforums.com/showthread.php?t=510472
 
Your schematic is not available. The 555 is a relatively low power device, so if you require it to deliver much power output, you need to follow the 555 with a power amplifier.