I'm not very pratical as I just started learning electronics and I'm planning to make some experiment with Raspberry Pi.
I'm trying to control a 5v relay board that, I think, is made for Arduino, as Raspberry only has 3.3v GPIO.
It's active low, as GPIO.LOW activates the relay, and the 3.3v keep it active too, so I think I'll need exactly 5v to turn it off.
So, basically I think I'll need a transistor, with the base controlled by my GPIO, that will activate a 5v line to Input line of the relay switch.
I have thought about these schematics, but I've been told it will burn my transistor as I need a resistor between 5v and the transistor collector.
My question is certainly basic, but... WHY?
When no current flow through base there will be no problem, when the transistor gets activated isn't my load the relay board? Why do I need other resistors?
Thanks in advance.
This is the relay board I bought, I couldn't find schemas, so I can't provide more.
I have thought about these schematics, but I've been told it will burn my transistor as I need a resistor between 5v and the transistor collector.Because once you turn on the transistor, you basically short circuit the 5V to Ground. It would try to push AMPS through the short, damaging the transistor and likely your power supply. \$\endgroup\$