The dc to dc buck circuit is a DC buck circuit that converts high voltage from DC input to low voltage from DC output. Ac circuit with a transformer can be boosted, reduced voltage, but direct current circuit can not use the method of transformer. It can use the principle of switching power supply to transform the voltage to achieve voltage reduction, and can also use linear circuits to achieve voltage reduction. The most convenient is to use the dc~dc buck module.
DC to DC buck circuit is very simple, only need a small IC can be achieved. For example, the common 7805 and 7812 are 12V to 5V and 18V to 12V respectively; There are also ams1117-ads, which can be converted from 5V to 3.3V\/2.5V\/1.8V\/ etc., and the output voltage value is determined by adjusting the sampling resistance value.