250W Inverter Circuit

A 555 timer (IC1) generates a 120-Hz signal that is fed to a CD4013BE flip-flop (ICl-a), which divides the input frequency by two to generate a 60-Hz clocking frequency for the FET array (Ql through Q6).
250W Inverter Circuit - schematic

Transformer Tl is a 12-/24-V center-tapped 60-Hz transformer of suitable size.

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