- #1
CaspianTiger
- 17
- 0
http://i5.photobucket.com/albums/y160/bornstubborn101/circuit3.jpg
This is the circuit. Basically i need to calculate the two resistors that would make up the potentiometer at VR1 to give a voltage of 3V.
I was going to use
VR1 = R2/(R1+R2)*Vs
The make:
R1= VR1/Vs*(R1+R2)
However apaprently this is wrong due to the +15V and the -15V inputs and that i need to use this equation.
R1=(0.5- VR1/VS)*(R1+R2)
I don;t know where this equation comes from so i can;t really use it in my report. Does anyone know where this equation comes from and how i can explain it.
Thanks
This is the circuit. Basically i need to calculate the two resistors that would make up the potentiometer at VR1 to give a voltage of 3V.
I was going to use
VR1 = R2/(R1+R2)*Vs
The make:
R1= VR1/Vs*(R1+R2)
However apaprently this is wrong due to the +15V and the -15V inputs and that i need to use this equation.
R1=(0.5- VR1/VS)*(R1+R2)
I don;t know where this equation comes from so i can;t really use it in my report. Does anyone know where this equation comes from and how i can explain it.
Thanks
Last edited by a moderator: