Help, which model of op amp is this? - Page 1
Forum section: electronics / beginners

author: gejianyong
author_rank: Contributor
timestamp: March 03, 2024, 06:12:38 am
content: 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

author: coppercone2
author_rank: Super Contributor
timestamp: March 03, 2024, 06:20:40 am
content: 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

author: Smokey
author_rank: Super Contributor
timestamp: March 03, 2024, 06:25:28 am
content: Maybe this will help... Here is a picture of the dude working on the probe

author: gejianyong
author_rank: Contributor
timestamp: March 03, 2024, 07:03:17 am
content: The left model is unknown, and the right model is speculated to be AD811

author: gejianyong
author_rank: Contributor
timestamp: March 03, 2024, 07:26:59 am
content: The picture is above. Please help me take a look.

author: Simon
author_rank: Unknown
timestamp: March 03, 2024, 08:42:58 am
content: How about you just design your own product rather than try to copy someone else's.

author: gejianyong
author_rank: Contributor
timestamp: March 03, 2024, 08:46:17 am
content: It's damage repair, not copying

author: Simon
author_rank: Unknown
timestamp: March 03, 2024, 08:56:56 am
content: 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.

author: Smokey
author_rank: Super Contributor
timestamp: March 03, 2024, 11:28:00 pm
content: Quote from: Simon on March 03, 2024, 08:56:56 amWhile 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??

author: coppercone2
author_rank: Super Contributor
timestamp: March 04, 2024, 04:25:42 am
content: I think maybe there is more to this then we can see from this thread (priors)

author: Simon
author_rank: Unknown
timestamp: March 04, 2024, 07:22:15 am
content: Quote from: Smokey on March 03, 2024, 11:28:00 pmGiven 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?

author: Smokey
author_rank: Super Contributor
timestamp: March 04, 2024, 07:29:35 am
content: Quote from: Simon on March 04, 2024, 07:22:15 amIf the OP had drawn a picture of Simon in this thread it would look like this:

author: Simon
author_rank: Unknown
timestamp: March 04, 2024, 08:35:54 pm
content: Quote from: Smokey on March 04, 2024, 07:29:35 amAnd 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.

author: gejianyong
author_rank: Contributor
timestamp: March 05, 2024, 10:52:28 am
content: Uploaded circuit diagram+see if it's helpful

author: gejianyong
author_rank: Contributor
timestamp: March 05, 2024, 10:56:15 am
content: 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 pinJust uploaded the circuit diagram and see if it's helpful

author: sharow
author_rank: Contributor
timestamp: March 05, 2024, 11:30:37 am
content: At first glance, it might be AD8137 or similar.

author: gejianyong
author_rank: Contributor
timestamp: March 05, 2024, 02:04:02 pm
content: Thank you very much for your help. I will purchase this model for replacement testing