Carl

if you check out for live mains and then you encapsulate the led, capacitor=
,
etc. you won't have any danger.

One of those may work for you.

http://www.ebay.com/sch/i.html?_trksid=3Dp5197.m570.l1313&_nkw=3Dneon+lamp+=
220+v
olt&_sacat=3D0

Rodolfo

-----Mensaje original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de
Carl Denk
Enviado el: Viernes, 31 de Agosto de 2012 12:39 p.m.
Para: Microcontroller discussion list - Public.
Asunto: Re: [EE] LEDS on AC


Agreed that's one way. Unfortunately,  I don't have the space for that,
maybe there's a cubic inch. But you bring up an interesting possibility.
Since if the power is on there would be considerable amperage flowing,
would a toroid transformer made with numerous turns of a light gauge
(maybe say 20 ga.) wire, and then the LED and a reversed diode work. The
nameplate says 240 volt 4500 watts. But that's wouldn't say the power is
on, just that current is flowing.

The LED, capacitor, reverse diode, fuse, and resistor seem easier.

On 8/31/2012 2:39 PM, YES NOPE9 wrote:
> Buy a cheap AC to DC adapter on eBay or similar.
> I have seen 110-220V AC to 5V USB adapters for 10 cents on eBay.
> They are probably crap..... but you can salvage one locally from
something.
> Then you have isolation.
>
> Best
> Gus
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