I'm working on my first electronics project. Basically I'm trying to control an rgb led strip from a raspberry pi's gpio pins. I'm trying to convert the raspberry pi's 3.3v up to the 5v required for the led strip. I bought these level converters https://www.amazon.com/gp/product/B0148BLZGE/ref=oh_aui_detailpage_o01_s01?ie=UTF8&psc=1. The docs for the level converters say both 3.3v and 5v need to be supplied at all times. Does this mean I need a seperate 3.3v power supply in addition to the led strips 5v power supply? This is assuming the GPIO pins should be sent through the channel pins on level converter and not through the 3.3v pin.
That is a simple mosfet level translator. But there are two issues, see update:
It uses pull-ups to each voltage, to do the level translation from low side to high side, and back.
You need to connect the 5V power to the HV pin, the 3.3V power to the LV pin, and your GPIO to the appropriate pin.
The RPI has a 3.3V power rail you can use. It is fairly small in terms of current, but will work great for this purpose, as this circuit has a very low current need.
Based on the reviews on the amazon page, you either get a simpler board, with just mosfets and resistors, which work as I described above, or you get the pictured one, which includes a 3.3V regulator. In that case, all you need to connect is 5V, the Gnd, and the GPIO.