- #1
brad sue
- 281
- 0
HI,
I have his problem on open collector and I don't know how to deal with it:
In the figure attached, the first transistor is driven by an output of the MCU, with the goal of turning the LEDs(several in parallel) on and off.
Compute the values of R1,R2,R3 required to make the circuit work properly, if it can.
Please can I have some suggestions meaning the step I need to do.
My idea for the first resistor R1: If the output is low, The transistor inside the output of the MCU will sink current, letting T1 off I am right?
However, I don't know how to solve the case where the output is 'high'. Please can someone help me? what the different currents do at the first node?
Thank you
B
I have his problem on open collector and I don't know how to deal with it:
In the figure attached, the first transistor is driven by an output of the MCU, with the goal of turning the LEDs(several in parallel) on and off.
Compute the values of R1,R2,R3 required to make the circuit work properly, if it can.
Please can I have some suggestions meaning the step I need to do.
My idea for the first resistor R1: If the output is low, The transistor inside the output of the MCU will sink current, letting T1 off I am right?
However, I don't know how to solve the case where the output is 'high'. Please can someone help me? what the different currents do at the first node?
Thank you
B