After We had post DIY project about USB power supply for last 2 day. Today,We are going to take the circuit of MAX604 for convert 5V DC from USB to 3.3 V DC. This DIY project is build for 3.3V electronic devices and gadget. I take the IC regulator “MAX604″ for reduce voltage from between +2.7 V and +11.5 V DC of voltage source to 3.3 VDC for standard devices. If you had read about USB power supply that we were presented. You just can change IC MAX604 on the circuit only. 3.3V Power Supply Circuit Electronic Component list IC MAX604 1 Pcs. Diode 1N4044 1 pcs Capacitor 10 uF/10V , 2 pcs. PCB Wire cable Female USB connector. Real picture below show is electronic component installation on PCB.