I mean something like this:
http://discovercircuits.com/PDF-FILES/acwhiteleds.pdf

-----Mensaje original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de
RussellMc
Enviado el: Jueves, 30 de Agosto de 2012 03:17 p.m.
Para: Microcontroller discussion list - Public.
Asunto: Re: [EE] LEDS on AC


Another version of the same concept.

http://www.radiolocman.com/shem/schematics.html?di=3D105459



On 31 August 2012 10:09, RussellMc <apptechnz@gmail.com> wrote:
> Russell McMahon said:
>> One could easily enough [tm] build an LED driving from mains  supply
>> that provided power to a reservoir capacitor when Vmains is under say
>> 10V near the zero crossing points. There are power supply ICs that do
>> that
>
> Interestingly, the attached circuit is essentially exactly what I had
> in mind. I thought I was "making it up on the spot" (it's a fairly
> obvious idea) but I MAY have been recalling an 11 year old email :-).
>
> _____________
>
> Ken Mardle (private correspondence) replied to me:
>
> Many years ago Siemens published an appnote for their (then new) SIPMOS
series
> MOSFET devices that worked pretty much as you describe to provide
low-power
> low-voltage non-isolated DC supplies directly from mains.
>
> See the e-mail I sent you 30/08/2001 titled "low cost regulator".  Note
that the
> circuit is now over 30 years old !
>
> A copy of my version of the schematic as originally attached is again
attached.
>
> Regards,
>
> Ken Mardle

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