Most industrial equipments today uses switching type power supply in replace for the conventional linear power supply because of its efficiency and savings on electricity. Aside from its efficiency, switching power supply are lighter in terms of its current per pound ratio, its no wonder why all computer’s CPU are powered by a single switching power supply capable of delivering high current at the rated voltages.
In this project, it uses a switching power supply salvaged from old CPU. Before finding a second hand switching power supply, ensure that the 12 volts rating has a total current above 15 amps so that it will handle most mobile transceiver with a power output range of 50 watts.
Modification starts by removing the unwanted wires from the switching power supply. Unsolder all the colored wires except for the yellow (+12V), red (+5V), green (power enable), and the black (ground). You can attach binding posts at the external casing for the 12 volts DC output (yellow and black). Another binding post for the 5 volts DC output (red and black). A single SPST switch can be included for the POWER_ON (green and black). Overall modifications can be finished within an hour so there should be problem in building this project. ---73 de hevir
