The car dc to dc converter project for converts from 12V car battery to dual voltage of +40V Ground and -40V Available of +/-27V ; +/-30V ; +/-30V; +/-50V
This is 5V to 12V boost converter circuit or higher using transistor circuit,When if you want a negative voltage from a positive power supply.
This is a DC to DC Buck converter working principle. We often use it as a step down DC to DC converter circuit. Because it is a switching mode power supply.
Can we build the switching dc power supply circuit with 2 transistor? This may be a good choice for you.