zachtheterrible
Active Member
Can anybody provide me with a schematic for a PSU that will output 0 - 20V or more? And at least 3A?
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With only 28VAC, if your transistors are weak, you might have a max DC output voltage of 28V at full load. Trying for a higher output voltage would result in high ripple (hum).zachtheterrible said:I cannot find a transformer that you recommend on mouser. The closest I can find is 28VC.T , 3.6A. Those ratings are given in RMS. It is 100VA. By the way, what does VA mean? Would that suffice?
Other people have tried microwave oven transformers. Because they don't have enough turns, their inductance is low so they use a lot of current without much load. It doesn't matter for a 900W oven but it could heat itself with 200W in addition to the power of the supply project.I have an old microwave oven transformer. Perhaps I could wind my own? I would imagine it to be pretty easy because I would be using large gauge wire with not very many turns.
Their price went up 2 bucks but they are good for this project.zachtheterrible said:audio, I tried digikey like you said and they do have them, but they're 9.50 a piece!!
Digikey has the Hammond 182M30 torroid transformer which is 30VAC/5.3A. It is a good one.Digikey doesn't have the transformer you specified either.
zachtheterrible said:What do you think about this one?
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The way I see it, the transformer is going to cost me $50, plus roughly $60 for other parts, not to mention the case that I have yet to buy, I was also going to put in a way to monitor voltage and current in the system. I think this is the better buy.