Benchtop Test Power Supply



I have been wanting to build this little fellow for ages now!

It’s been a waiting game as I had been finding complete computers on hard rubbish piles and taking their power supplies for bits and pieces…  I was lucky enough to grab more through a work mate and thus the donor for this project was sourced.
I’d like to say a big cheers to my man Hayden for egging me on and telling me to do this! thanks bloke!
There isn’t a great deal to this but there are some words of advice:
Now that I have been so informative of the dangers of opening up a power supply let us continue…
You will need the following bits – I went to Jaycar – They are awesome, cheers.
– Binding Posts – I grabbed different colours for ease of identification.
– Switch – Optional but recommended – You can just hard wire the supply to start up when you plug it into the wall socket – I’d rather it switchable! Some also have switches on them but mine didn’t!
– LED – Optional – My supply had one so I just used that.
– Binding post banana connectors – optional but you’d be silly not to get the same As I did with alligator clips on the other end for easy connection to wires.
You’ll need quite a few different tools etc so ensure you have pliers, strippers, tape etc.
 The biggest tip I have from here is to strip the wires into their respective colour groups and shorten down whats not needed for the binding posts and tape them off – do it twice, to ensure they are shielded and placed them in a cavity away from the lid so your posts will fit in without jamming it all up.
You can just place the 12v wiring through on a post for testing if that’s what you desire but I figured why not have them all – they are there anyway…  In terms of drilling the holes out for the posts take the bloody lid off! I watched some videos of guys doing it with the lid on and was horrified… you’ll hit a capacitor! I did!
When you have your wiring all sorted make sure to tape over the binding posts – you want to totally eliminate the risk of blowing this thing up.. let’s make it last.
Test the lid out to ensure it fits and doesn’t grab wires or foul on anything.. don’t force old mate he’ll get upset.
Once all of this is sorted test it with a multimeter to make sure you’re clear before feeding power to the supply..
If all is good go for it! I tested mine out with a 12v Toyota interior dome light and all was A-OK!
This is one of those projects that requires some experience, a little effort and my goodness is it handy. imagine how many projects can be tested right there on your bench! and for less than $15 why wouldn’t you!
Happy Testing!

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