hai i'm doing a project where it involves me to make use a dc-dc volatage converter but i can't get one so i want to design the dc-dc converter circuit. Can someone help me?
IN : 9 - 18VDC
OUT : 3.3 VDC
there is an input of 12V and a Vcc of 3.3V and also relay of 12V
i have uploaded a picture of partial circuit. I need to make a new circuit to replace the DC-DC in the circuit with a circuit that will have input of 9-18V and output of 3.3V
A "converter" usually means isolation from input to output. Since you just need a voltage reduction with a common ground, I think you need a "regulator". Look up LM317, for example.