Hello,

Can anyone help me the fomulars how to find the output voltage Vo in the circuit below?

Thanks alot.

ken

 

Assuming that the 649k (R1, R2) resistors are always equal and the 200k resistors (R3, R4) are also always equal then the following formula applies:-

Vout = (V1-V2) 200k/649k

and the output voltage will theoretically be zero in your circuit because both inputs are at the same voltage. In practice, due to component tolerances and the op-amp input offset voltage it will not be exact.

 

What have you found out about the gain of an IA configuration?

What have you deduced about the range over which the output voltage can change?

Did rou want to identify the polarity of the input?

 

Hi,

THe input voltage is 36vdc (batt. neg and batt. pos). Why is the purpose of Zenner Diode for?

Thanks

 

Hi,

THe input voltage is 36vdc (batt. neg and batt. pos). Why is the purpose of Zenner Diode for?

Thanks

Which way is the battery connected? Does the positive terminal connect to R1?

 

Assuming that the 649k (R1, R2) resistors are always equal and the 200k resistors (R3, R4) are also always equal then the following formula applies:-

Vout = (V1-V2) 200k/649k

and the output voltage will theoretically be zero in your circuit because both inputs are at the same voltage. In practice, due to component tolerances and the op-amp input offset voltage it will not be exact.

You need to specify which input is V1 and which is V2. Your equation is correct if V1 connects to R2. Otherwise, you need a minus sign in front of it.

This equation does not include the zener.

 

Hi,

Here is the correct circuit. I need to caculate the Vout scale voltage.
Please help.
thanks

Ken

 

Hi,

Here is the correct circuit. I need to caculate the Vout scale voltage.
Please help.
thanks

Ken

The circuit is a differential amplifier, with a zener limiter added. The zener may not be conducting.

 

How to find Vout scaled voltage? Which is the fomular?

Thanks

Ken

 

How to find Vout scaled voltage? Which is the fomular?

Thanks

Ken

"Differential amplifier" is a BIG hint. Be creative. Use Google. You might learn the formula AND the derivation of it.