I built this Power Supply for quick multiple voltage bench top Supply, for testing of LEDs & circuit's.
I used the first lm2596 too produce the 5 volt up to 3 amps and the second lm2596 for a 12 volt reference voltage controlling the transistor for the 5 amp regulated output.
I built the Power Supply inside a deep single switch plastic electrical (handy) box.
After construction and 3 hour load testing of transformer and circuit's, the heat started building up in the small plastic project box.
I stopped the test and added a small 5 volt fan to move some air around the transformer.
I resume the load testing for 6 more hours with no problems or heat build up.
Parts used:
1-3055 transistor
2-lm2596 dc to DC buck converter.
1-2x4 electrical box extra deep size.
1-2x4 box cover
1-240v to 24v air conditioning Transformer.
(This is powered by a 125v outlet)
1-5 position terminal strip.
( a output for testing circuit's)
1-small fan to remove heat from the box.
