Groceries...
So... I needed a LED strip for my 3D printer. And a fix for a heatsink that fell off the heated bed MOSFET.
Oh, and laundry detergent. ![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
The 0.100" pin header was just cuz.
![Evil >:D](https://www.eevblog.com/forum/Smileys/default/xevil.gif.pagespeed.ic.tdrs7Uj5gu.png)
And as usual... Amazon wanted my business, so there they were with next day delivery. Who am I to say no...?
300mm x 6mm COB LED strip is actually quite excellent for ~US$4.50 via Amazon; it appears to have no ballast resistors of any sort, so a CC driver or regulated DC & ~10W+ ballast resistor is the way to go. It's rated 12V/800mA; at 10.5 volts it just turns on. At 12.0V it draws 620mA; at 12.1V 770mA, at 12.2V 910mA. Brightness is quite good at 620mA; that's where I'd set my drive current to decrease the likelihood of a shorted element.
0.100" Pin headers... Ehhh, they're like bread. Not really interesting until you don't have any. ![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif.pagespeed.ce._hfWAz_QHO.gif)
I have a project where I'll PROBABLY need some; so I added them to my quick list. 48 strips of my most commonly used types for ~US$11. I know... still expensive... when you're used to getting them for pennies as leftovers from work BOMs... but about as cheap as you'll get these small quantities anywhere next day to your door.
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
What I thought y'all would be most interested in though is
these little MOSFET PCBs. This whole MESS cost me just under CAD$17, or about US$12.
They claim they're good for use on 24V-powered printers up to 25A draw and will work w2ith pretty much any of the popular 3DP controllers. It uses a
YMP200N08Q MOSFET; several site on alibaba list it as equivalent to IRFP2907 & HY4008
(PDFs below) 80V/200A switching MOSFET.
![Confused :-//](https://www.eevblog.com/forum/Smileys/default/confused0024.gif.pagespeed.ce.5xOqKkq0Co.gif)
It has indicator LEDs for power & PWM; it's designed to take the heated bed output of the FET on your RAMPS or similar 3DP controller board (typically at 12V or 24V) and use it to trigger this big beast. It rectifies the signal through a bridge, then to an opto-isolator; then through a a few resistors to tame the signal to the typical ~10 volts these brutes can handle across the gate.
I see them as cheap pass-element building blocks; easily mounted at a DC load and controlled remotely by pretty much anything, but designed to be fast enough for PWM power switching.
![Cool 8)](https://www.eevblog.com/forum/Smileys/default/xcool.gif.pagespeed.ic.cOxV6sPNRd.png)
mnem
Good thing I only really NEED one of these... I'll probably test one or two to failure. ![Evil >:D](https://www.eevblog.com/forum/Smileys/default/xevil.gif.pagespeed.ic.tdrs7Uj5gu.png)