Adjustable Step Up And Step Down Voltage DC Power Supply Box

thingiverse

This text describes an inexpensive power supply built with eBay parts and featuring adjustable step-up/step-down voltage regulators, two voltmeters for monitoring input and output, and four panel mount 5.5 x 2.1mm DC power jacks. The bill of materials and schematics are provided, along with assembly instructions detailing the required connections and hardware. The total cost for parts is under $35 USD if purchasing everything new. The design files are in Cubify Design format from 3D Systems, making it a printable project. A heavy-duty 12V supply powers the device, allowing adjustments to 24V for some fans and 7-8V for others using the step-up/step-down functionality or passing through the 12V supply directly. Assembly involves cutting and soldering 20 wires, driving in 16 screws, and mounting two switches; it takes approximately two hours. A PDF file lists the bill of materials and suggested eBay items to purchase, while another document captures a schematic illustrating circuit connections. A custom protoboard is used for wiring, with specific instructions provided on how to connect components. The box lid design allows access to regulator adjustment pots, and labels are included on both the power supply and voltmeter jacks for easy identification. This project was created as a learning experience in 3D printing and CAD software, resulting in a functional and useful design that is shared with others in this text.