DC Switching Regulate 3A
Small Zener diode voltage regulator circuit with PCB, using transistor and few parts. it is simple and cheap fixed dc source circuit. As one of best choice.
This is 5V 3A Switching Regulator circuit by LM2576-5.0 is simple switching power supply 3A step down regulator for power digital circuits. [...]
How to make it light long time or use battery longer than usual. we use this Switch mode LED driver circuit using transistors. and simple circuit below [...]
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.