Why did I blow my power supply (part 2)?
Hi there,
Thank you all who tried to give me some tips yesterday in regards to why my zener diode was super hot, and ultimately why I blew up my 12v power adapter...
I have checked that there is indeed resistor between PSU and diode, and direction of zener diode seems fine (the black line on the + side, right?)
So i decided to take a picture of my breadboard and post it here in hopes that someone can tell me what i am doing wrong. The first file is the schematic that I followed (stepper motor driver) and the other 2 are from my breadboard with a close up on the zener diode. Of course, if you have a lot of time and feel like checking my whole connections, I would really appreciate it also.
One more thing, you will see that the gentlemen who created this schematic decided to use a light bulb as resistor right before going into the + of motor. He said that this way, if you need more current (for bigger motor), you can just change the bulb for a 20w instead of a 4w bulb.
So when i blew my psu, I was running 12v 200ma with an 18watts bulb. The bulb lit up and the motor was buzzing. Then nothing but a burning smell!!!!!
Thank you for your help.
MAX