Transformerless Power Supply - AC-110v to DC 5v 1A (60hz)

[JuanDH]

Believe me, my life will be MUCH easier if I can put an external supply is not that I don't want to do it.

Maybe buying those $2.5 opening them and using the boards inside them to my purpose.....

[dhouston]

If it must be internal, start here...

Other chip companies make similar ICs.

[Ioannis]

The Elektor circuit is working from 0 to about 39 volts. So it is not a problem for the 110 VAC.

You do not have to make any changes.

Maybe only R5 to a lower value, say 15 ohms, but I doubt it is going to be needed.

The design is very clever and very efficient.

Although no isolation is offered. Watch out!

Ioannis

[Docedison]

ANY Construction that Directly uses the PS Mains should be a last option and then ONLY by a competent Tech or better an Experienced Engineer... IMHO
You Could get your self DEAD or worse, Someone else...
Besides it is much easier to buy and install a connector for the right supply... IMHO
Doc

[JuanDH]

All comments and experiences are more than welcome. I just ordered the module from Digikey (Recom AC/DC) so at least I don't have to worry too much about it. It is costly ($14 for 5v 400ma) but I don't want to play with safety here and these little modules are UL certified.

Thanks