I looked thought the data sheet for the 2N3906 pnp transistor, it looks like it can switch the voltage, it also says that the emitter base it 5vdc, does that mean that i can do away with the resistor on the control side the connects to the microcontroller. or does that resistor provide a specific function other then altering the voltage similar to resistrors used on led's
I also had one question about making the circuit, the ground pin on the transistor is shared correct, the ground of the 24 volts will connect to it and the 5 volt ground off my controller will connect to this as well, since the ground line is 0vdc this is safe, then all i have to do is send the microcontroller pin to high to activate the transistor and inturn switch the selected relay. Is this the general concept.
does NPN or PNP type matter?