Hello
How can i determine what is the maximum input voltage that an Opamp can withstand regardles output Voltage?
I want to make an input stage tha can hold up to +/- 50 Volts
I dont know what to look for in datasheets
Without scaling, in my opinion, it's not possible.
You can test yourself. For example, you input a sinewave into an opamp, which is supplied by +/- 5V and configured as voltage follower. Then you slowly increase amplitude of the sinewave and when the amplitude is higher the 5V, the output will be distorted.
I dont want to amplify the signal i want to downgrade it.
Now i want to know if it is possible
1.To use +/- 5V power supply with an Opamp
2. Have an input signal +/- 50V downgrading it without distortion or destroing the Opamp.
By downscaling I assume you are wanting to reduce the input signal to some lower value. To do this just use a voltage divider network. like 10:1 that will cut your signal down to +-5V from +-50V.
It will not introduce any noise as it is passive. IT will change the signal to noise ratio though.
To maintain or attempt to maintain the signal to noise ratio
you can use a inverting amp with a input resistor that is 10x the feedback resistor you can apply the +-50V input signal to the input resistor.
By using a inverting amp you are placing a virtual ground at the - input of the op amp this will prevent overvolting the input to the op amp.
This will however invert the signal. if that is a problem use another inverting amp with unity gain. this will restore the phase relationship to the input.
I dont want to amplify the signal i want to downgrade it.
Now i want to know if it is possible
1.To use +/- 5V power supply with an Opamp
2. Have an input signal +/- 50V downgrading it without distortion or destroing the Opamp.
Answer:
[1] Why not? You can supply LM741 with +/- 5V.
[2] You will not destroy the opamp if you scale down the +/- 50V to say +/- 5V. Resistor is passive device. It should not distort the signal pass through it.
no,you can not apply more than the d.c biasing voltage required for opamp.sice the 741 ic has maxinum biasing voltage is +-15v.if u apply more than this voltage at i/p .opamp become saturated.you can not get more than the saturated voltage.