Hello Everyone,
I appreciate any help in advance!
I'm have a basic understanding of DC Circuits, and this is my first time working with transistors. I'm using a Lego NXT to switch multiple fans On and Off. I have a 12v NiMH Battery Supply that is connected to a 12v 4.0amp fan and the NXT is switching the transistor with a 7.5v supply. Currently I'm using a single MJE3055T Transistor. My issue is this: When using ANY value base resistor the E3055T rapidly generates heat, if I'm not using a resistor it gets hot but MUCH slower than it does with a resistor.
How can I get this transistor in to saturation without overheating? Do I need to be using a Darlington?
I'm guessing that this is happening because the circuit is trying to pull all amperage from the base? When the voltage at the base is low the fan is drawing a lot more current?
Thanks!
I appreciate any help in advance!
I'm have a basic understanding of DC Circuits, and this is my first time working with transistors. I'm using a Lego NXT to switch multiple fans On and Off. I have a 12v NiMH Battery Supply that is connected to a 12v 4.0amp fan and the NXT is switching the transistor with a 7.5v supply. Currently I'm using a single MJE3055T Transistor. My issue is this: When using ANY value base resistor the E3055T rapidly generates heat, if I'm not using a resistor it gets hot but MUCH slower than it does with a resistor.
How can I get this transistor in to saturation without overheating? Do I need to be using a Darlington?
I'm guessing that this is happening because the circuit is trying to pull all amperage from the base? When the voltage at the base is low the fan is drawing a lot more current?
Thanks!