This voltage power adapter designed for car use only. And you know that a car voltage generally is 12 Volts. How about when you want to connect non 12 volts devices into your car?. The following power adapter circuit is the solution. Even the circuit is design for a car apppliance, it does not seem it can’t be used for another purpose. But you can try modifying it for any purposes. Here is a schematic car power adapter
Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.