For your micro project these circuits is not suitable. It has a no isolation
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IT WILL BE BETTER TO USE 230VAC/ 9VAC TRANSFORMER & 7805 IC
Yes you are right about this. It reminds me of the old transformerless tube transmitters. I think this is a problem with all these transformerless designs. But in a bridge configuration this would not matter I think. The ony circuit that is affected is the one BEFORE the bridge.Additional consideration for tranformeless and other mains power power supplies is to use Live on Neutral place and vice versa. At wall socket for mains power you dont have marked what is Live and what is Neutral, all depends how user connect plug in wall socket. Because that some transformerless designs are very very dangerous.
Always look to use isolation in designs.
Best regards,
Peter
use st micro electronics viper12a series based smps
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this is the simplest & efiicient circuit for smps. 5volt 3a . dont look any other desgins. isolated from mains no shock hazard.
the transformer is a miniature size. if you want isolation from mains then this is the best one.
the entire circuit can be made on 1.5square inch pcb
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t1 is a cmc choke used for filteration it cannot be used as isolation transformer.
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