DC Power Supply Project

May 27, 2022

A bench power supply is an essential tool for all electronics hobbyists. Building one is the right of passage for every electrical engineer. My BCIT program included a 4-week course ELEX 1102: Electronics Fabrication Tools and Techniques, in which we built a very basic bench power supply.

We learned soldering skills in this course. We also learned how to use Altium Designer to design our own PCBs. In another course I learned how to use AutoCAD and designed the body for this power supply (reference design provided by BCIT). 

The DC Power Supply provides three DC voltage outputs when powered by a 120VAC 60Hz source. The rated DC output voltages are +5VDC (fixed), -15VDC (fixed), and +20VDC (variable). The rated current at each output is 1A.

BOM (Electrical)

Ref Des Value/PN Description Pkg Qty
C1,C2 3300uF, 20% 25V, AI electrolytic Radial 2
C3, C5 0.1uF, 20% 50V, AI electrolytic Radial 2
C4,C6 1uF, 20% 50V, AI electrolytic Radial 2
C7 2.2uF, 20% 50V, AI electrolytic Radial 1
D1,D2,D3,D4 1N4005 1A, 600V, General Purpose DO-41 4
D5 Pilot light, LED, Red 1
F1 375mA, 250V Cartridge, Glass, Time delay 1
J1 Banana jack, Red, Nut 1
J2 Banana jack, White, Nut 1
J3 Banana jack, Violet, Nut 1
J4 Banana jack, Black, Nut 1
P1 125V, 10A 1.8m, 18 AWG/3C Grey 1
R1 10R, 5% 10W Axial 1
R2,R4 390R, 5% 1/4W Axial 2
R3 5K, 10% 1/2W, Linear 1
S1 120V, 5A SPST, Round rocker, Dot 1
T1 33VCT/1A 33V, Center tapped, 1A 1
U1 7805 Regulator, 1A, Fixed, 5V TO220-3 1
U2 317 Regulator, 1.5A, Variable TO220-3 1
U3 7915 Regulator, 1A, Fixed, 15V TO-220-3 1

Schematic diagram, interconnect diagram, and body CAD...

Class photo
Posted in UncategorizedTags:
Related Posts

I learned Schematic and PCB design using Altium Designer at BCIT. My plan was to do some more practice over the Summer. To my surprise, a few weeks after the end of the course our accounts were disabled even though I thought we had…

As you might know from a previous post, I built Ben Eater’s 8bit TTL CPU on breadboards in the past. The CPU is fully programmable with 16 bytes of memory and 11 Op Codes that can be used to write programs, one instruction per byte. This…

This is my second Ben Eater project. In this video series, Ben talks about how VGA signals work and walks us through building a circuit that provides the correct timing of sync signals so that a monitor recognizes the signal and displays an image…

Write a comment