I have ordered logic-level MOSFETS of the type IRLZ34N (for the sake of working on a Raspberry Pi) but I have problems in Wiring it up.
I have so far connected:
+12 to the +12v lane of the switch
FET Drain to the blue color of the switch
FET Source to the negative terminal of the lab PSU
FET Gate to GPIO pin
My setup is comparable to this diagram:
Apart from me having only wired one color, not three and not using TIP120 but IRLZ34N. Same pinout (Gate/Drain/Source and Base/Collector/Emitter, read from front left to right)
However, the LED strip just lights up blue right away. Even with the raspberry pi turned off. Or the Gate Wire removed from the jumper cable (i.e. 100% sure that there is no voltage on gate)
Where did I go wrong?