555 based single-button control of power switch circuits
555 based threshold voltage comparator circuit
555 based AC automatic voltage regulator with protection circuit
555 based automatic battery charge control circuit
555 based Automatic constant current charging circuit uninterruptible power supply
555 based DC 12V to AC 220V power inverter circuit
555 based DC - DC converter with isolation circuit
555 based DC boost circuit
555 based high voltage and low voltage monitor circuit
555 based mains power supply circuit