Since the electric tank is backup to our gas well fed natural gas tank,
it is rarely used, but would like an indication if it is inadvertently
left on, generating a high electric bill.

You can use Neon lamps, it' s cheap and ready made or do it yourself, a neo=
n
lamp and a resistor.

For circuit protection I think a pigtail fuse may work, 30 ga wire I guess
is not advisable.

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 05:48 a.m.
Para: Microcontroller discussion list - Public.
Asunto: Re: [EE] LEDS on AC


Thanks for the comments. :)

Understand, a while back Ford had a recall on pickups. The stop light
circuit was protected by say a 10 amp fuse, and went from the stop light
switch on to the cruise control in addition to the vehicle and trailer
stop lights. The free TSB was to add a low amperage fuse at the switch.

For circuit protection, I was thinking of either a pigtail fuse, say 1/2
amp, or a piece of wire wrap (30 ga. ??) as a fusible link. With the few
components, I wasn't thinking of a PCB, but jut twist and solder leads
together, then pot the whole thing in a block of  epoxy. The location is
on the hot water heater access panels for changing a heating element.
There is a little concern, the tank insulation is foam, don't know how
flammable, but going to conservatively assume it is.

Since the electric tank is backup to our gas well fed natural gas tank,
it is rarely used, but would like an indication if it is inadvertently
left on, generating a high electric bill.

Any comments appreciated.

On 8/31/2012 6:03 AM, Nily wrote:
> Carl
>
> Take care, there is no galvanic isolation. You have main power.
>
> Rodolfo
>
> -----Mensaje original-----
> De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]En nombre de
> Carl Denk
> Enviado el: Jueves, 30 de Agosto de 2012 03:50 p.m.
> Para: Microcontroller discussion list - Public.
> Asunto: Re: [EE] LEDS on AC
>
>
> The top one of this looks like what would work. Thanks much . :)
>
> On 8/30/2012 6:35 PM, Nily wrote:
>> I mean something like this:
>> http://discovercircuits.com/PDF-FILES/acwhiteleds.pdf
>>
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