240 volt ac to 13.8 volt dc 40 amp power supply.

Top View: Left 8 X 2N3055 pass transistors, 4 X nuts in square arrangement to the right are 4 x 1N1184 diodes (bridge rectifier), the lone nut centre far right is the 2N682 SCR (crowbar).

Front View: From the top: output terminals, 2 X red LED's, 110v ac fan running at half speed (50v ac), mains switch, 10 amp fuse, fan switch on / off (I leave it on constantly)

Side View: That is an "AA" size battery on the transformer for you to get an idea of the physical size of the unit ( the psu weighs 40 - 50 lbs).

Close-up of the transformer.

Close-up of the regulator board (the heatsink is a bit overkill on the TIP41A drive transistor!

Close-up of the pass transistors wiring arrangement with a 5 watt .1 ohm ballast resistor on the emitter of each 2N3055 transistor.