Hey everybody,
I need a circuit for upgrading a amperage of 40mA to 960mA to get enough power for driving one of the RGB-strings of 48LEDs in a series connection.
I know that it is possible with a curcuit which includes MOSFETs.
So the LED-strip I got is "powered" with +12V and controlled by the negative poles and I nearly dont know anything about mosfet types.
Thats why I dont know which I should choose and how to connect them.
And finally I want to apologize my bad english!
Please help me!
Greeting,
Indh3x
You want a Logic Level N-Channel MOSFET. The Gate goes to the Arduino pin. The Source connects to the - side of the LED's (Cathode). the Drain connects to the ground side of the +12V supply AND to the Ground of the Arduino.
Most MOSFETS are rated with a Gate voltage of 10v. You want one that will switch fully on at 4.5V or less. These are called "Logic Level" because they are compatible with 5V TTL logic levels.
Alternatively this circuit uses a transistor, you substitute your LED strip for the solenoid:-
You will also need a power supply that gives 12V @ 1A.
Sooo is it possible to choose that MOSFET down there?
I have got a power source which gives U=12V and I=2A.
Yes that FET will work for you.
How much is I and U after passing the "Mosfet-circle"? ---> Dont want to destroy my LEDs!
Not sure I understand that.
A 12V LED strip has the current limiting circuit built in, so you just feed it 12V with a power supply that will deliver the required current when asked.
I want to do it like u see it down there (its just a excerpt)! My question is, how high the resistance should be to dont damage the board (Arduino UNO).
I want to connect 96LEDs (48LEDs on each of both "strips"). One needs 60mA ( cause its a RGB-LED) and 3V and the little resistance which u need before every LED is allready on the Strip.
untitled4.0.bmp (3.49 MB)
Use a 100R resistor in line with arduino output and the gate of the FET. As drawn you need current limiting resistors on the LEDs but I don't think the LED strips are like you have drawn them. Normally you just connect them to 12V don't you? If that is true you don't need any more.
Thanks! Can be closed!