You can use two different approaches. You can use two different approaches. the first and perhaps easiest – is to use a simple linear regulator, but this raises other problems – wasteful spending power, but you can go the other way and use a pulse transformer, which is more economical.
Note : The basis of the converter is a PWM controller based on integrated circuits LM 2575-5, having the output of 5 volts with a current up to 1A. To enable / disable the converter uses pin 5 On / Off , controlled transistor VT 1.
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