View Full Version : Anyone have instructions on how to build a power supply?

02-04-2014, 10:33 AM
Looking for instructions on how to build a power supply. I know Bob Campbell has a good pdf but his website is down. Looking for something siimilar to get me started. Want to use the original PS from my BP Boss 5 to save money during my upgrade.

Weston Bye
02-04-2014, 10:51 AM
Not being critical here, but the question is similar to "how high is up?" Give us a little more information. What is the application? How many volts and amps? Regulated? How much ripple can be tolerated? Single voltage, dual voltage?

Fill in the blanks as best you can and prepare for multiple opinions - most of them probably mostly correct.

02-04-2014, 10:58 AM
Exactly, Power supply for what?
Try a ATX computer power supply. 3.3V, 5V, 12V, 24V; DC, 300W, & CHEAP.

02-04-2014, 11:45 AM
The Gecko site has some very good instructions on power supplies. Try them.

doctor demo
02-04-2014, 01:23 PM
Looking how to build a power supply. Want to use the original PS from my BP Boss 5 to save money during my upgrade.
I was looking over the Digital forum to direct You to a pertinent post when I discovered that You have found Your way there. Good luck on the build.


02-04-2014, 03:37 PM

02-04-2014, 05:38 PM
While building is admirable, sometimes it just doesn't pay. What is the end application for your power supply or are you just seeking enlightenment :D

I have two 1500 watt power supplies from these folks:

destined for different projects. Their transformer prices are worth a look as well. If you have a well stocked junk box, you may not need a transformer... at least for small stuff. My junk box has been accumulating 'stuff' for 50 years... I still had to buy power supplies... a lot of my transformers are for power supplies used for tube circuits. Not much demand for them anymore.

There is an article on the construction of a mosfet linear regulator as opposed to a bipolar (transistor) power supply in the Nuts and volts February 2014 issue... possibly at your at your local library.


Paul Alciatore
02-04-2014, 05:57 PM
Thanks for the idea. I am going to work on something to post.

02-04-2014, 05:59 PM
It's hard to beat switching supplies for most purposes. I have used the following company for many power supplies, and you can get just about anything for as little as $0.12/watt:
http://www.mpja.com/24-Volt-Power-Supply-12A-LHV/productinfo/30466%20PS/ $35/300W

Apparently the OP needed a supply for a Bridgeport Mill, and has received assistance. But it's good to know other places to get PSUs cheap. Another good source for these as well as other interesting stuff is:

Here is a "shocking" deal on a 6kV supply for $10:

02-04-2014, 06:33 PM
If the power supply is for running stepper motors
I built one out of a micro wave transformer.
Took a little time but boy was is a hefty supply.
Duck Duck Go and find some plans on the web.
olf20 / Bob