Hello Guys,
I am struggling to simulate and understand below circuit but unable to understand it.
Could anyone help me out ?

Circuit Explanation -

In place of R6, R5 i have to use humidity sensor. So i consider it 56 ohm resistor.
R3, R4 is bridge resistance.

My circuit understanding is - U2 is differential amplifier with gain of R9/R8.
I do not know how U1 is working without any feedback component.

Could any one help me to understand this circuit ?
Ltspice file is attached herewith.

 

hi mishra,
The LTS asc file you posted is not the same as circuit red diagram posted.?
E

 

In place of R6, R5 i have to use humidity sensor. So i consider it 56 ohm resistor.

Do you have the spec of the sensor? Does it act simply as a passive resistor or as an active voltage (or current) generator?

 

hi mishra,
This is your Red circuit in LTS, this is the plot
Please check my circuit for accuracy.
E

 

hi mishra,
The LTS asc file you posted is not the same as circuit red diagram posted.?
E

Sorry please find actual circuit.

Thank you for pointing out !

Regards,

 

hi mishra,
This is your Red circuit in LTS, this is the plot
Please check my circuit for accuracy.
E

View attachment 272115

Hey,
Uploaded my circuit.
Your circuit seems okay.

Regards,

 

Do you have the spec of the sensor? Does it act simply as a passive resistor or as an active voltage (or current) generator?

Hey Alec_t,

to be very frank no idea about humidity sensor.
It might be resistive.

Thanks for your support.