This is the DC switching regulator Voltage 5V at current 3A. It is make for digital circuit. The important part of the circuit is LM2673, it is 3A Step-Down Voltage…
All about switching power supply circuit diagram and PCB
This is the 9V Step-Up Voltage Regulator. We used the RC4193 Micropower Switching Regulator is the base, so low current power output. But The advantage of this system is although input the voltage input change from 2.4V to 10V but a constant voltage output 9 Volt.