Hi, I'm trying to design a flyback DC-DC converter which can provide up to 24V DC from a normal 12V DC lead-acid battery that every car has. It can be used to run radios, small lights, relays, horns and other 24V accessories(multiple output) from a 12V vehicle. I have done research on flyback topology and design the circuit diagram. I couldn't get the 24V DC from the output, after I assembly all the components. Is my design having problem or I selected the wrong flyback transformer? Attach are my design and the info of flyback transformer. http://images.elektroda.net/11_1312757763.gif http://www.farnell.com/datasheets/323239.pdf IC chip is UC3843AN(current mode) and flyback transformer is myrra 74014. PLS HELP and advice!!! Thank you.