Here i will show you a simple tutorial to convert your USB keyboard to comfortably adapt to a PS/2 connector in a computer.

The Situation
I had actually bought a flexible keyboard from the market and i had no idea that it had a USB socket to the output. I was using this USB keyboard for a couple of days and after using it for some time it was giving me trouble. Sometimes the keys did not function properly and sometimes it would automatically eject i.e disconnect from the computer port and again connect. I was having such problem and decided to find a solution for it.

The conception
After doing a bit of research i found out that most of the modern keyboards can be easily adapted to a PS/2 connector with ease. The only thing you need is just the USB socket and a PS/2 Jack (i got mine from an old mouse of mine). I also found out that when you buy a keyboard and if it is for the long run like in a Personal Computer, then it is better to have a PS/2 connector bought. Since the flaws for buying a USB keyboard are (i) It is gonna occupy one of the USB slots in your computer and hence there will be no space for USB when you are connecting multiple com ports. (ii)It is gonna use some kind of processor time since it has plugged into a USB. Very nice to have one more empty USB connector
Therefore my suggestion for you all if you are buying for a Personal Computer is to buy a PS/2 keyboard in place of USB. But again if you have already bought it then this instructables is gonna teach you how to accomplish the feat.

Step 1: The Project

Parts needed:-
1. USB SOCKET 1 PCS
2. PS2 JACK 1 PCS
3. CABLE HAVING 4 WIRES. (ANY)

Then the only thing you have to do is see the circuit diagram that i have submitted here and solder the wires according to the pins. You are then done.
Your USB keyboard will be hooked to a PS/2 converter and will work just fine.
It should also be noted that some old keyboards will not work as the parts used inside the old keyboards will not generate the required cock timings required for the motherboard to comply with it.
But most of the Keyboard will definitely work.

Step 2: Analysis and Completion

Now after you have successfully wired the USB socket with the PS/2 jack, it's time to test weather the connection were made rightly. Check the continuity of the wires.
Then finally apply some duct tapes or paper tapes to conceal the hotglue remainings so that the wire gets a rigid shape.
And finally your DIY cable is complete.