Simple voltage limiter
I recently added a 180MM computer muffin fan to my intake window. The fan, a silverstone FM181 which employs a variable speed 10k ohm potentiometer, has an operating voltage from 5v to 13.2v. ht...
Forum Discussion
DSchmidt_2000 wrote:ken white wrote:
It looks like it needs about 2-3 volts of headroom so it is probably a series regulator.
You may be better off with an old school shunt regulator and only use it when equalizing the batteries.
It's not - it's a dc-dc buck converter - even says it in the title. You can see the inductor on the board.
http://www.ti.com/product/lm2596
LandYacht - give it a try. Cheap enough and probably doesn't require that much headroom above the target voltage. Besides you could just run your fan at a slightly lower voltage if needed.
I was actually commenting on the first supply and the OP posted again. but either way every real power supply has headroom.
Even if its a buck switching supply, look at the input and output voltage specifications and you can see the headroom requirements.
There are always voltage drops across the various switching and storage components since this is a real, not ideal switching supply.
EDIT: To the OP, I would just measure the current through the motor at maximum rated voltage and then size a rheostat to control the current through and voltage across the motor terminals - cheaper, easier, and less things to go wrong.
