**need help with AC to DC and DC to DC power supply TT**

ahdehling said:

first of all, i think i shall intro myself! hi all, im Adeline nice to meet you all im a newbie in engineering and im in a project of making a DIY 2.1 speaker, and im in charge of the all powerful power supply

ok back to project *dies* i will try to give as much details as i can so help a poor newbie please ><

like i say, i need to design a power supply for a 2.1 speaker. I need a AC to DC and DC to DC circuit

AC to DC
Input Voltage: 230-240Vac
Output Voltage: 14.2Vdc
Power needed: 50W
Current: 3.5A

transformer > full wave recitifer > shunt regulator[a resistor + zener diode] > output [more or less what i plan to use for the circuit]

I dont know what else is needed..but i need to design the circuit, with what is needed, and the value of each parts [like the value of resistor and etc].

DC to DC
Input Voltage: 18.5Vdc
Output Voltage: 14.2Vdc
Power and Current: 50w and 3.5A

Im thinking of using a buck converter IC but Im unsure of how the ic works.. and what else is needed..

please try to help me as much as possible >< [and fast too TT]



thanks all for reading

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