I'm trying to control a bunch of small solenoids by powering them with a ULN2803. I'm running a test program that has them on much more often than I will need. The solenoids do get a little bit hot, but what I'm worried about is the the ULN2803 gets really, really hot. I have two questions:
will turning the solenoids on less often prevent it from heating up as much?
i may have too much current or something, but i don't know how to test the current draw of the solenoids. how do i check the current draw? Also (showing my level of knowledge here), is the draw different if you have one on at a time versus having many on at the same time?
thanks in advance