Hi
Welcome to the forum.
If by 'bench power' you mean a bench power supply with variable voltage and current limit (some refer to this as constant current) - bad idea!
Your first problem is finding the pin out.
2nd problem - some need a minimum load before they will regulate properly.
3rd problem - they do not have current limit, they will just dump maximum current output.
4th problem - they are quite noisey so not suitable for analogue work eg op-amp circuits
You see many many people doing this but honestly it is not a good idea. Just go out and buy a bench psu. They can be picked up very cheap on ebay.
There are many home brew projects for linear bench psu on the internet.