12 more posts in this thread. [Missing image file: wiredup.png]
First off, let me start by saying I'm pretty new to electronics, and I could really use some help.
Here's what I'm trying to do. I want to control a 12V RGB LED strip with an arduino. Right now I'm focusing on just getting one of the color channels to work, expanding to all 3 colors should be trivial.
The LED strip has a common positive connection. I'm using a IRF510 mosfet.
Now I'm completely confused as to how I should wire the thing up. I connected a PWM pin of the arduino to the gate of the MOSFET and a pull-down resistor to ground. The positive lead of the LED strip is connected to the +V connection of the power supply. One of the color channels of the LED strip is connected to the source of the mosfet. The drain of the mosfet is connected to ground.
I also connected the ground of the arduino to the -V of the 12V power supply. (picture included as attachment, just imagine the single LED in the image is a LED strip)
When I do this, the LED strip lights up no matter what. Even if I disconnect the gate pin, the LED strip will still light up ... which confuses me to no end. How can current flow through the mosfet if there is no charge on the gate? No matter what I do I can't seem to get the thing to work like I want it to.
6 more posts in this thread. [Missing image file: 20130914_212032.jpg]
I have scoured Google to no avail. I cannot find a set of replacement fan blades for the ones my friend's drunk girlfriend tried to do pull-ups on... I kid you not.
Anyways, I cant seem to figure out even the brand. The fan has absolutely no distinctive marks or logos, and the blade connector (pic is relevant) is one I can't seem to find anywhere. There is the number YG-237 shown on the blade, which I cannot seem to find anywhere on the internet, and the number Q1111-B on a similar sticker on the fan, again, with no luck on Google.
Please help or my landlord will charge me about 5 times what the blades are worth for them to replace them.