Hi people,
Just wondering how I can make my 12 volt PS variable from say 5v to the full 12v and with a load of 5A or so.
I am using a old ATX power supply at the moment but want to vary the output on the 12v via a pot. This is to fine tune the cooling on my modded 40D.
At the moment it is fed a full 12v through a switching regulator to keep the temp stable but I find that it`s on and off ever few minutes and I have read that a TEC`s lifespan is greatly reduced with all this on and off use.
Have seen on the net the use of the LM-338k to do this but I would loose the full 12v? and will it handle the full 5A current?
Anyone that is electronic savy and can help or have some info would be greatly appreciated!.
cheers Gary