non contact thermometer circuit

[stanoo none]

Hello,
i am total amater regarding whole electronics thing, but i was wondering how difficult both skill wise and financially it is to build simple non contact thermometer circuit with little display.

I would like to instal a non contact sensor aiming at loudspeaker coil inside of a speaker box measuring its temperature few cm away, wired to a small display outside of the box. it doesn't need to be very accurate +- 2c or so.

could you please point me to right place? possible circuit, sensor display etc?

thank you

 

[Reloadron]

You could think about rolling your own IR Thermometer with the parts available and some building blocks. However, in my opinion, I doubt you could build a good working model for what it cost to simply buy one. You may have to hack a little to get an isolated display but I still see buying over building as a viable inexpensive solution. While I don't see it effecting your application when using these devices remember to consider emissivity. Also keep in mind using a IR Thermometer or for that matter other temperature sensors will give you the surface temperature of the voice coil and not the core temperature.

I can buy a IR Thermometer at my local home improvement store for about $30 USD, I can't build one that inexpensive.

Ron

 

[MikeMl]

I have a older version of one of these I use all the time for checking heatsink temperatures...