Hello,
I'm an absolute beginner, so I'm hoping somebody can help me with this basic question. It's also my first post!
I have built a simple circuit (from instructions I found at http://www.heatsink-guide.com/content.php?content=control.shtml) which controls a small cooling fan, using a thermistor to maintain a constant temperature.
I'd now like to take a cheap LCD digital thermometer which I bought a while ago, and build it in to the same enclosure.
The digital thermometer runs from a single 1.5V battery, so I need to know how to connect it up to the 12V DC supply which is powering the fan controller circuit. Apart from that, the thermometer and the controller circuit will be completely separate.
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.
Thanks,
Kevin
I'm an absolute beginner, so I'm hoping somebody can help me with this basic question. It's also my first post!
I have built a simple circuit (from instructions I found at http://www.heatsink-guide.com/content.php?content=control.shtml) which controls a small cooling fan, using a thermistor to maintain a constant temperature.
I'd now like to take a cheap LCD digital thermometer which I bought a while ago, and build it in to the same enclosure.
The digital thermometer runs from a single 1.5V battery, so I need to know how to connect it up to the 12V DC supply which is powering the fan controller circuit. Apart from that, the thermometer and the controller circuit will be completely separate.
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.
Thanks,
Kevin