Controlling 3 fans 5v

Hi, first of all sorry my english.

I need to control 3 pc fans.. I was looking at some diagrams and found this:

can i use that diagram to connect 3 fans? i need 3 resistors, 3 transistors and 3 diodes? thanks

This circuit will blow the transistor as soon as the transistor is turned on, it will connect the +Ve supply to ground.

What you need is a modification to the circuit that puts the motor in series with the transistor.

Connect the +Ve side of the motor to the supply. Connect the -ve side of the motor to the collector (top) of the transistor. Connect the diode across the motor with the anode connected to the -ve side.

In the circuit, the diode is connected with the anode to +Ve and cathode to ground. As soon as power is supplied, it will short circuit and burn out.

This circuit gets a definite fail!!

Weedpharma

kunaguero:
I was looking at some diagrams and found this:

weedpharma:
This circuit gets a definite fail!!

… that’s the danger of taking stuff from destructables.

can i use that diagram to connect 3 fans? i need 3 resistors, 3 transistors and 3 diodes?

The attached is how you should do it for one motor. For three yep just triple up…

motor and transistor.png