This instructable will show you how to make a very good bench power supply using mainly recycled parts. This is the really the "mark II", you can see "mark I" here.
When I finished my first bench power supply I was really happy, and used it very often, almost every day, until one day it decided not to work anymore, :( so... I realized I had to do it all over again, including the not that easy drilling on the metal of the ATX, etc. So this time I'm making a bench power supply that you can replace the ATX in no more than 2min.
Last time I did not take any pictures of the process, so I could only do a slideshow of the finished product, but this time I took lots of pictures, so I did this Instructable, which I hope you'll like.
May you decide to go ahead and build your own?... I would like to take the opportunity to say that I will be more than happy to help you with any questions you have, and also I will love suggestions so I can improve either this instructable or the bench power supply itself.
As the title shows, with this instructable I want to encourage people to recycle. There are lots of things around the house or even in the streets, that you can take components off, and use them later to make so many interesting things. I used as many recycled parts as I could for this project, and if you do the same, you could have a very powerful and COOL! bench power supply for almost nothing.
OK.. lets start with a view of what we will be making....
Here is a list of the materials and tools I used for this project. Some of them are optional, like the analogue panel meters, as you could use any multitester to check ether the voltage or amps.
1).-(1) Voltage panel meter (Optional £6 ebay, view)
2).-(1) Amp panel meter (Optional, £6 ebay, view)
3).-(1) 6V Mini Relay (Optional, £1.31, view)
4).- (2) 9v PP3 Battery box (£1.29 each, view)
5).-(1) 9v Buzzer (Optional, £1.99, view)
6).- (2) 9V PP3 Batteries
7).-(1) 1N4001 Diodes (Recycled from old radio)
TOTAL COST = £16.59
GRAND TOTAL= £ 24.19
note: In this list of materials I specified where I found some of the parts I've used. I'm not saying that you need to buy an OHP or a home heater to get the parts, but maybe you already have some of these things at home and they don't work any more, or you can find then on the street, or in garage sales or in markets like the one you see in the picture below.