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Power supply --cheapest way

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dipnirvana

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Input specification : 60VAC to 300VAC ,45Hz to 65Hz
Output specification: 3.3V@0.3A, 5V@0.1A
Standard : Safety and CISPER 22

Wt do u think is the best and cheapest way to acheive it. One option i thought was transformer less capacitor based design , but current seems to high. Other is flyback (TNY II) based cost of it =3USD . Cann't we have cheaper soloutions ?
 

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