Need Help: How to calculate input output voltage relation

[atulk038]

Hello,

In the above circuit I want to know the output equation and wanted to know working of the given circuit
Supply Voltage - +15V to -15V
Vin = 2.5sin(2*3.14*400*t) V.
Thanks.

 

[Easy peasy]

the impedance of Vin is not shown, this affects the gain at any frequency .....

 

[KlausST]

Hi,

When Vin > 0V then output saturates close to negative supply.
When Vin < 0V then output saturates close to positive supply.

All the feedback circuitry is about useless.
Read about "inverting Opamp circuit operation". It needs an input resistor to work properly.

Please use one of the free simulation software to check circuit operation.

Klaus

 

[atulk038]

the impedance of Vin is not shown, this affects the gain at any frequency .

Complete schematic

 

[KlausST]

Hi,

Still missing the input resitor to U22.

Now you have an inverter in front of the circuit above...
Thus:
When Vin < 0V then output saturates close to negative supply.
When Vin > 0V then output saturates close to positive supply.

Klaus

 

[Easy peasy]

yup - that is a poorly designed circuit as drawn ....

 

[betwixt]

... and using a 741 with those values, you can almost ignore the feedback network except for R1 and input source resistance.

Brian.

 

[KlausST]

Hi,

Oh yes, true.
I did not read the values yet. But they really make no sense.
Neither the rediculously low 1.5pF nor the non_standard 2.71k.

It´s no practically meaningful circuit.

Klaus

 

[FvM]

For a first estimation, the OP will work as comparator. Output waveform is a 400 Hz square wave. You can omit all R and C and get approximately the same output with the 2.5 V sine input.

 

[crutschow]

That circuit obviously does not do what you expect.
It needs to be redesigned by someone who understands how opamps work.