piclist 1998\10\03\223626a >
Thread: 230VAC->5Vdc without transformer
face BY : James Cameron email (remove spam text)

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

Depends on the current you want.  ;-)  A PIC doesn't take much, but are
you driving anything with it?

I've never done it, but I've seen described a simple high voltage
capacitor, then a diode forward biased, then into a 5V2 zener with an
electrolytic capacitor across it.

                                     +5V          0V
                                      O           O
                                      |           |
                                      +----| |----+
  240VAC                              |           |
                | |                   |           |
    O-----------| |-----------|>|-----+----]<|----+-----O
                | |

active        high vcap       diode        zener       neutral

I'm not qualified to tell you how to do this safely.
Perhaps others can fill it in with component values and limits.

James Cameron                                    (.....cameronRemoveMEspamspamstl.dec.com)
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800

<3616DE1C.2696ECB7@stl.dec.com> 7bit

See also: www.piclist.com/techref/power.htm?key=transformer
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