While working on my lighting project tonight, I pulled a good one, fried $60 worth of hardware, figured I'd share so everyone can have a laugh.
Back story: Hooking up netduino plus 2 to control a series of LDD-H drivers from meanwell via PWM.
Have netduino working great, playing with PWM on the onboard LED, feeling good. Get my driver boards from China, source my drivers, have my LED's and a 48v power supply. Solder everything up, going to use an adafruit PWM expansion board as I need 15 channels. Figure I'll play with the onboard available channels as I only need 5 to prototype for now. I Start hooking up, get to the part where I tie the drivers to the board. PWM to PWM, no problem. Doesn't work.
What am I missing??
A common Ground!!
I'm an electronics newbie, I admit it. I google around and it appears that I need to tie the (-) on the drivers to the grnd on the board. Easy peasy, already have ground from the board on the breadboard, just need to tie it in.
Here is a tip: don't choose the VOUT pin of a driver to tie it in, that's the WRONG ONE.
Choose the (-) from the power supply that is going to the vin(-) of the drivers.
Results of hitting the wrong pin: Fried Driver, Fried Netduino plus 2. Now I get to wait for 2 days for my new N+2 to arrive