how to convert 3-24Vdc to 12vdc

[noobies99]

any help/tips or schematic? how can change unregulated dc voltage ranges from 3v to 24v to regulated 12v dc. my source is a AC varying from 3 to 24V.

 

[indulis]

You could use something called a buck-boost converter.

 

[noobies99]

thanks for the reply.
i read a topic about buck-boost converter and i found out that their source was a battery/cell.

Is it applicable to my case:
my source is a AC voltage from my motorcyle generator(the voltage is about 3v in idle state going up to about 24v when i pump up the gas and the frequency is hard to determine)
i already have a circuit to rectify it.

 

[indulis]

The DC source does not matter... whether it's a battery or rectified AC.