danielsmusic
New Member
I'd like to experiment with MOSFETs and bipolar transistors to drive a motor via CMOS chips.
I will be arranging them both in H-bridge configuration.
Ever since I started experimenting with logic ICs I've never actually been able to get a logic chip to drive any sort of transistor. My understanding of a MOSFET is that I will need a higher voltage at the gate than the drain to fully saturate it. Whereas, with a bipolar transistor, you need a few 100mAs...which is out of the question.
So, could I bring them both together and use a MOSFET with a resistor at the source to drive the base of a bipolar transistor? Would it not be possible to use either of them on their own?
All my attempts have failed, even with very small bipolar transistors. The transistors I have are TIP2955 and TIP3055. I've not decided on the MOSFET. I would like to also drive the motor directly with a MOSFET. As I believe that the switching time is much faster (for PWM). The motor is 12V and the chip is driven by 5V.
Could someone give me a crash course with maybe some drawings? I would appreciate it.
I will be arranging them both in H-bridge configuration.
Ever since I started experimenting with logic ICs I've never actually been able to get a logic chip to drive any sort of transistor. My understanding of a MOSFET is that I will need a higher voltage at the gate than the drain to fully saturate it. Whereas, with a bipolar transistor, you need a few 100mAs...which is out of the question.
So, could I bring them both together and use a MOSFET with a resistor at the source to drive the base of a bipolar transistor? Would it not be possible to use either of them on their own?
All my attempts have failed, even with very small bipolar transistors. The transistors I have are TIP2955 and TIP3055. I've not decided on the MOSFET. I would like to also drive the motor directly with a MOSFET. As I believe that the switching time is much faster (for PWM). The motor is 12V and the chip is driven by 5V.
Could someone give me a crash course with maybe some drawings? I would appreciate it.