Electronics > Projects, Designs, and Technical Stuff
op amp test jig
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rstofer:

--- Quote from: Zero999 on January 09, 2019, 02:06:50 pm ---
--- Quote from: quadzillatech on January 09, 2019, 01:51:31 pm ---i found one on another forum should fit my needs!,see attached,cheers m3vuv.

--- End quote ---
Yes, that should do a basic check. I'm not sure how well the '741 on the output will work, as it might have its input taken outside its common mode range though. No doubt it could be simplified somewhat.

--- End quote ---

I think the 741 may be hard to find.  I need a bunch, in the metal can, if anybody runs across a source.
I'm not sure what to substitute and there are hundreds and hundreds of op amps.
Zero999:

--- Quote from: rstofer on January 09, 2019, 04:06:32 pm ---
--- Quote from: Zero999 on January 09, 2019, 02:06:50 pm ---
--- Quote from: quadzillatech on January 09, 2019, 01:51:31 pm ---i found one on another forum should fit my needs!,see attached,cheers m3vuv.

--- End quote ---
Yes, that should do a basic check. I'm not sure how well the '741 on the output will work, as it might have its input taken outside its common mode range though. No doubt it could be simplified somewhat.

--- End quote ---

I think the 741 may be hard to find.  I need a bunch, in the metal can, if anybody runs across a source.
I'm not sure what to substitute and there are hundreds and hundreds of op amps.

--- End quote ---
The 741 is widely available in SMT and DIP packages. The metal can is rare. I think I have some lying around but don't know if they work, so wouldn't sell them.
https://www.digikey.co.uk/products/en?keywords=ua741
https://uk.rs-online.com/web/c/semiconductors/amplifiers-comparators/op-amps/?searchTerm=ua741&redirect-relevancy-data=636F3D3126696E3D4931384E53656172636847656E65726963266C753D656E266D6D3D6D61746368616C6C7061727469616C26706D3D5E5B5C707B4C7D5C707B4E647D2D2C2F255C2E5D2B2426706F3D31333326736E3D592673723D2673743D4B4559574F52445F53494E474C455F414C5048415F4E554D455249432673633D592677633D4E4F4E45267573743D7561373431267374613D756137343126&r=f&searchHistory=%7B%22enabled%22:true%7D
exe:

--- Quote from: rstofer on January 09, 2019, 04:06:32 pm ---I think the 741 may be hard to find.  I need a bunch, in the metal can, if anybody runs across a source.

--- End quote ---

Why do you need exactly 741 and in metal can?
Zero999:

--- Quote from: exe on January 09, 2019, 04:46:27 pm ---
--- Quote from: rstofer on January 09, 2019, 04:06:32 pm ---I think the 741 may be hard to find.  I need a bunch, in the metal can, if anybody runs across a source.

--- End quote ---

Why do you need exactly 741 and in metal can?

--- End quote ---
My first instinct was to say temperature, but after Googling the data sheets, I couldn't see any difference in the temperature rating, to the ceramic DIP. The only advantage for the metal can is heatsinking. The junction to case thermal resistance is specified for the can, but not for the DIP and TO-5 heatsinks are available.
http://www.ti.com/lit/ds/symlink/lm741-mil.pdf?HQS=TI-null-null-mousermode-df-pf-null-wwe&DCM=yes&ref_url=https%3A%2F%2Fwww.mouser.co.uk%2F

The only other reason is authenticity. If one is repairing an old piece of equipment, using original parts can help to preserve its value.

Mouser sell the TO-5 packaged 741 but it isn't cheap:
https://www.mouser.co.uk/ProductDetail/Texas-Instruments/LM741H?qs=QbsRYf82W3H3APg1dDoXnw==
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