Hi everyone,
I am looking for a MOSFET transistor to use in my circuit and after much experimentation and failure I thought I would ask here.
I am using an ATTiny85 (with a max output from its signal pins of 40mA) powered with 2xAAA batteries to change the speed of a motor using PWM, so the max power to the MOSFET will be 3V from my 2xAAA batteries. The motors I am powering are rated at 1.5 - 3V with a max of 250 - 460mA @ 3V. There is a 0.1uF capacitor across the motor terminals and also at the power source.
I tried using a 2N7000 - however, it seemed to act quite erratically (it seemed like the ATTiny kept resetting) and when working, the motor was very very weak and kept stalling.
I also tried using a 7030BL which was more stable and gave a slightly higher power to the motor than the 2N7000, but was still not close to the strength the motor can get to when you just apply the 3V from the batteries directly.
So I was wondering if anyone would be able to suggest some more transistors to try. I am looking if possible for a TO-92 package, or if this fails a SMD option. The main thing is that the motor is as efficient and strong as possible, without draining too much current from the ATTiny (I believe that this might have been the issue I describe above but not sure)
I believe I want a MOSFET where the Rds(on) is rated at a Vgs of 3V or less, but beyond this I am really struggling with all of the variables of the MOSFET when I look at data sheets.. any explanation or further links would be really useful, I am trying but still struggling!
Thanks so much
A
I am looking for a MOSFET transistor to use in my circuit and after much experimentation and failure I thought I would ask here.
I am using an ATTiny85 (with a max output from its signal pins of 40mA) powered with 2xAAA batteries to change the speed of a motor using PWM, so the max power to the MOSFET will be 3V from my 2xAAA batteries. The motors I am powering are rated at 1.5 - 3V with a max of 250 - 460mA @ 3V. There is a 0.1uF capacitor across the motor terminals and also at the power source.
I tried using a 2N7000 - however, it seemed to act quite erratically (it seemed like the ATTiny kept resetting) and when working, the motor was very very weak and kept stalling.
I also tried using a 7030BL which was more stable and gave a slightly higher power to the motor than the 2N7000, but was still not close to the strength the motor can get to when you just apply the 3V from the batteries directly.
So I was wondering if anyone would be able to suggest some more transistors to try. I am looking if possible for a TO-92 package, or if this fails a SMD option. The main thing is that the motor is as efficient and strong as possible, without draining too much current from the ATTiny (I believe that this might have been the issue I describe above but not sure)
I believe I want a MOSFET where the Rds(on) is rated at a Vgs of 3V or less, but beyond this I am really struggling with all of the variables of the MOSFET when I look at data sheets.. any explanation or further links would be really useful, I am trying but still struggling!
Thanks so much
A