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Thread: 230VAC->5Vdc without transformer
www.piclist.com/techref/power.htm?key=transformer
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face BY : paulbEraseME@RemoveMEmidcoast.com.au



Seth Fischer wrote:

> Is there a better or more efficient way of obtaining 5V d.c. with a
> small compact circuit?

 Yes, use a series capacitor (mains rated) with a 1/8W (fusible)
resistor in series and a bridge rectifier if the application is not
linked to one mains terminal, or a "voltage doubler"-style pair of
rectifiers if it is.

 Note that this arrangement will not allow you to detect the mains
zero-crossing; if you want that you can use a low-power resistor *as
well*.

 You tell me how much current you need, what ripple you will tolerate,
and I'll give you the (rough) values.
--
 Cheers,
       Paul B.

<3616DE32.4440@midcoast.com.au> 7bit

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