audioguru Posted April 10, 2014 Report Share Posted April 10, 2014 Here is a version modified for 36v acYou forgot to calculate that the single 2N3055 output transistor and the tiny 2N2219 driver transistor will melt if the output current is 3A and the output voltage is low or is shorted.36VAC produces a peak of 50.9V which causes the positive unregulated supply to be 48.9V. Then the output transistor heats with 47.5V x 3A= 142.5W. 60W is very hot fore it so it will be destroyed with 142.5W.You can work out the heating of the tiny 2N2219 driver transistor yourself.That is why our fixed and improved version uses a 28VAC or 30VAC transformer, two 2N3055 output transistors and a BD139 modern power transistor as their driver. Quote Link to comment Share on other sites More sharing options...
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