Help, which model of op amp is this?

[gejianyong]

Repairing a DP-50 differential probe. The chip model is polished. Please help. Does anyone know the chip model?
The left model is unknown, and the right model is speculated to be AD811

[coppercone2]

lol. it might help if you tell us the package, maybe reverse engineer the circuit a bit, identify rail voltage, and maybe even take a picture

[Smokey]

Maybe this will help... Here is a picture of the dude working on the probe 

[gejianyong]

The left model is unknown, and the right model is speculated to be AD811

[gejianyong]

The picture is above. Please help me take a look.

[Simon]

How about you just design your own product rather than try to copy someone else's.

[gejianyong]

It's damage repair, not copying

[Simon]

Then buy a new one. The last thing you want is to repair it and find that it is still not repaired properly and it does not give give you correct results but you don't realize it.

[Smokey]

Then buy a new one. The last thing you want is to repair it and find that it is still not repaired properly and it does not give give you correct results but you don't realize it.

While this is a strange thread to begin with, that comment is insane considering what this forum is all about..... Did you just tell that guy to NOT repair a piece of equipment and just buy a new one instead??

[coppercone2]

I think maybe there is more to this then we can see from this thread (priors)

[Simon]

Then buy a new one. The last thing you want is to repair it and find that it is still not repaired properly and it does not give give you correct results but you don't realize it.

While this is a strange thread to begin with, that comment is insane considering what this forum is all about..... Did you just tell that guy to NOT repair a piece of equipment and just buy a new one instead??

Given what I have seen of other posts and the fact that we were supposed to identify the chip from a crudely drawn block diagram this person is probably not skilled enough yet to repair anything. What do you use when you repair stuff? test equipment by any chance? can you trust that equipment and if so why. Would you trust something that is a piece of test equipment repaired by someone that was not able to repair it properly? So why are we all wasting our time on this?

[Smokey]

Then buy a new one. The last thing you want is to repair it and find that it is still not repaired properly and it does not give give you correct results but you don't realize it.

While this is a strange thread to begin with, that comment is insane considering what this forum is all about..... Did you just tell that guy to NOT repair a piece of equipment and just buy a new one instead??

Given what I have seen of other posts and the fact that we were supposed to identify the chip from a crudely drawn block diagram this person is probably not skilled enough yet to repair anything. What do you use when you repair stuff? test equipment by any chance? can you trust that equipment and if so why. Would you trust something that is a piece of test equipment repaired by someone that was not able to repair it properly? So why are we all wasting our time on this?

If the OP had drawn a picture of Simon in this thread it would look like this:

[Simon]

Then buy a new one. The last thing you want is to repair it and find that it is still not repaired properly and it does not give give you correct results but you don't realize it.

While this is a strange thread to begin with, that comment is insane considering what this forum is all about..... Did you just tell that guy to NOT repair a piece of equipment and just buy a new one instead??

Given what I have seen of other posts and the fact that we were supposed to identify the chip from a crudely drawn block diagram this person is probably not skilled enough yet to repair anything. What do you use when you repair stuff? test equipment by any chance? can you trust that equipment and if so why. Would you trust something that is a piece of test equipment repaired by someone that was not able to repair it properly? So why are we all wasting our time on this?

If the OP had drawn a picture of Simon in this thread it would look like this:

 

And you make my point very well. If someone showed you that picture and asked you to find the person, would you ever identify me? that is how pointless the question was. 

[gejianyong]

Uploaded circuit diagram+see if it's helpful

[gejianyong]

I have checked many models of operational amplifiers, but there is no indication that the 3 or 6 pins are connected to the power supply. This operational amplifier is very unique, and I think it is easy to find which model it is from the power pin
Just uploaded the circuit diagram and see if it's helpful

[sharow]

At first glance, it might be AD8137 or similar.

[gejianyong]

Thank you very much for your help. I will purchase this model for replacement testing