R1 to R6 is 470 ohm
Vdd is 20v
the arrow is connected to gate of PMOS, PMOS is sharing the same Vdd 20v

may i ask, why is there no resistor on the base of NPN ? if theres one, what is it used for ?
what is the purpose of R1 to R6 resistor?

sorry, my electronics is really horrible, i hope you can clear my doubt
thanks

 

The ULN2003 has Darlington transistor outputs, each with an in-built 2.7k base resistor.
R1-R6 are collector loads acting as pull-ups.
I can see no purpose for Q1-Q6 unless they merely represent the ULN2003 output transistors.

 

The ULN2003 has Darlington transistor outputs, each with an in-built 2.7k base resistor.
R1-R6 are collector loads acting as pull-ups.
I can see no purpose for Q1-Q6 unless they merely represent the ULN2003 output transistors.

yes uln ports connected to pic microprocessor
why R1-R6 is 470 ohm and not higher or lower?

 

why R1-R6 is 470 ohm and not higher or lower?

Ask the circuit designer. What does the PMOS switch control?

 

Ask the circuit designer. What does the PMOS switch control?

a BLDC motor

 

yes uln ports connected to pic microprocessor
why R1-R6 is 470 ohm and not higher or lower?

Maybe this is what you want.

 

Maybe this is what you want.

erm i want to understand how it works from the graph i am showing, thanks !

 

erm i want to understand how it works from the graph i am showing, thanks !

But the circuit is wrong.