Countrysquire
Well-Known Member
Attempted to build a PWM unit based on Walker's schematic today. Have everything soldered up, but I don't think that I got it right. Whether using a 9 volt power supply or a 14v, I only see about 2.7 volts on the output and not enough to spin a 12v computer fan. To make it worse, it has behaved differently at different times, sometimes keeping the fan spinning after starting it by hand, sometimes not. I've rechecked all the terminations and checked to make sure that there was no continuity across any of the traces from sloppy soldering.
Questions:
Should I have such a large voltage drop?
What is the best way to test one of these?
Thanks.
Questions:
Should I have such a large voltage drop?
What is the best way to test one of these?
Thanks.