The flood light should heat up nicely.

Bill

----- Original Message ----- 
From: "Tim ODriscoll" <tim@stokepogesway.net>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Saturday, December 17, 2005 1:39 AM
Subject: Re: [EE:] Detecting a blown lamp


> On Fri, 2005-12-16 at 20:20 +0200, Peter wrote:
>> Yes except it works well mostly for low loads (say <1A). Beyond that it
>> starts making a lot of heat for a small and unobtrusive circuit it is
>> supposed to be. A Hall current sensor is not so expensive by the time
>> you need to measure go/no go 7A and it has to take the inrush of
>> presumably 40-50Aish gracefully (i.e. even if the filament decides to go
>> just then). I'd still look into a simple thermistor siliconed to the
>> insulated side of the triac with extra shrink tubing to increase
>> insulation (you are using a triac, no?).
>
> I am using a triac, yes. The load that the brightest lamp will cause is
> 2A. I have another lamp which will pull 1A. I don't know if the triac
> heats up much when it's on with these loads though. I have a fairly
> large heatsink on it, but I make a point of not touching any part of it
> when it's got the 240vAC going through it, so I don't know if it heats
> up much.
>
> Although, thinking about it, I might have a temperature probe floating
> around somewhere for my multimeter.. I've also got a few ds1820's too..
>
> I'll give that a go..
>
> Cheers Peter,
>
> Tim.
>
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