Subject: Adding to the fan controller
By: Kevin Wilson (IP: 172.141.39.*)
Written on: 07-12-2006 14:00
I hope this isn't too off-topic.
I have just built the fan controller from this site to cool my AV cabinet, and it's working well. I would now like to put a cheap LCD thermometer, which I bought a while ago, into the same enclosure.
The LCD thermometer runs off of a 1.5V battery, and I would like to power it from the same 12V supply that is powering the controller circuit.
After a bit of searching, I think I might need to use two resistors in series (a voltage divider?). I don't really understand how this works - would I need to know the current that the thermometer draws? Is there a better way of reducing the voltage?
If anybody could help I'd be very grateful.