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....
Step 1: Materials and tools
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.
The same with tools, you may want to use a different tool, just go ahead, and also make any suggestions so we all can learn.
Don't be scared of the quantity of materials, this project is not really difficult to make, trust me, if I've done it, anybody can.
1).- (1)Bread box.( Recycled, you could use any other enclosure that you can fit the ATX in with enough space)
2).-(3) Switches (2 single way switches recycled from old heaters, and a 2 double way switch recycled from an OHP)
3).-Cable connectors (Recycled from old amplifier, and from old TV)
4).-(1) ATX (Recycled from old computer)
5).-(3) PC Drive Molex to SATA Power Adapter (ebay £1.50, view)
6).-(1) 20-24 Pin ATX power adapter for Computer PSU (ebay £2.77, view)
7).-(1) USB connector (Optional, Recycled from old computer)
8).-(2) LED's (red, green) , (Recycled from old computer)
9).-(2) 5K Potentiometer (One Recycled, and the other one bought for £1.35, view)
10).-(2) Potentiometer knobs ( Recycled from old amplifier)
11).-(1) empty can of coke (Recycled)
12).-(1) 8cm computer fan (Recycled from bench power supply mark I)
13).-(1) Magnetic Catch (Bought £1, view)
14).-(1) IEC cable (The cable that connects the computer to the power socket, Recycled)
15).-(1) IEC connector( Recycled from bench power supply mark I)
16).-Piece of trunking (Optional)
17).-Some cable ties.
18).-(1)Fridge magnet ("Stolen" from the fridge)
19).-Some wires. (Recycled from extension lead)
20).-(2) 8cm Fan grills (Recycled from old ATX)
21).-(2) Screw eyes.
1).-(1) LM350 Adjustable Voltage Regulator (ebay £0.50)
2).-(1) 560 Ohm Resistor (Recycled from old radio)
3).-(2) 1N4001 Diodes (Recycled from old radio)
4).-(1) 0.1 uf Capacitor (Recycled from old radio)
5).-(1) 10 uf Capacitor (Recycled from old radio)
6).-(1) Heat sink (Recycled from old radio)
7).-(1) 10W 10 Ohm Wirewound resistor (Maplin £0.48)
TOTAL COST = £7.60
If you want to use analogue meters like me, and you also want to make the continuity tester, you will also need in addition to the previous list:
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
2)-Hot glue gun.
3)-Dremel (With a cutting disc and round sander)
4)-Hole saw ( about 7cm)
8)-A Dymo (Optional, I don't have one, my wife did the labels for me at work, but you could print them and tape them)
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.