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thanks for every one helped me,
i reach a good level of my circuit design
i have 2 problems :
1- how can i achieve constanst voltage at no load like lm2576 switch mode regulator
2- when motor start alot of noise appear at chooper output and it become difficult to achieve desired voltage as fast...
i want to separate microcontroller input voltage (5v) from the circuit
i use lm2576 switch mode regulator to achieve 5 v from 48 volt
i don't know how to use pulse trnsformer to achieve this isolation
i think it may be like this
**broken link removed**
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