I made a linear power supply for HAM Radio use. The transformer has a secondary voltage of 18-0-18 at 240VAC input. Transformer has no labels or markings except for the primary and secondary voltages. The secondary wire size is 3.5mm. The transformer core dimentions are 11mm(h)x 8mm(d)x13.5mm(w). So no idea how many amperes the transformer was. Anyway, I made a 13.8vdc psu base on an Astron RM-50M schematics. The only difference are the pass transistors as I can't source the 2n3771 so I used the 2N3055x6 with 0.1 5W emitter resistor. Power supply works ok except that the pass transistors gets pretty hot at 1min keydown at 100W. Heatsink with thermal paste applied. Heatsink thickness is 3mm with fins. Any advice, suggestions to improve is welcome.
Thank you in advance.
Thank you in advance.
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