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Analog Devices AD741KH High Accuracy Op Amp TO-99 Metal Cap

 
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Smokedaddy



Joined: 07 Oct 2006
Posts: 828
Location: Phoenix, Arizona

PostPosted: Thu Dec 28, 2017 12:25 am    Post subject: Analog Devices AD741KH High Accuracy Op Amp TO-99 Metal Cap Reply with quote

Still playing with my 35mm Macrophoto. I wasn't sure how to remove the cap so I drew up a fixture and 3D printed it to hold the cap and used a parting tool on my lathe to remove it. Looks like I didn't get everything, o'well. I can still clean it up but I'm happy with the results so far. I could of taken a few more images for the stack too.

Much larger version here;

https://squattingdog.smugmug.com/Semiconductor-electronics/i-CmhK9M4/O





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mawyatt



Joined: 22 Aug 2013
Posts: 1118
Location: Clearwater

PostPosted: Thu Dec 28, 2017 6:55 am    Post subject: Reply with quote

That old 741 brings back memories Very Happy I have used many of them, they were/are the most versatile OP AMP ever! Fullgar (sp) invented the ua741 at Fairchild and Bob Wilder tried to one up him with the LM101 at National. Then George Erdi came up with the ua725 precision version op amp using a "Cross Coupled Quad" layout which reduced thermal feedback, process variations and input device mismatch all at once. The layouts are done with Rubylith and Exacto blades backs then, Fond memories of those days Rolling Eyes

The large metal area is the feedback capacitor, 40pF I recall.

Very clever fixture to remove the TO-99 lid Smile

And nice pictures too Smile

Best,

Mike
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Smokedaddy



Joined: 07 Oct 2006
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Location: Phoenix, Arizona

PostPosted: Thu Dec 28, 2017 9:01 am    Post subject: Reply with quote

mawyatt wrote:
The layouts are done with Rubylith and Exacto blades backs then ...


-JW:
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ChrisR
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Joined: 14 Mar 2009
Posts: 7341
Location: Near London, UK

PostPosted: Thu Dec 28, 2017 9:24 am    Post subject: Reply with quote

I see the first Op-Amp was produced in 1941 Shocked Shocked
I met 741's 30 years after that. I was surprised/horrified to see they still get a mention on the current Electronics school syllabus!
Good job with the Lomo - and the parting tool. Somewhere I have one of those cans I made a mess of with a hacksaw..
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Chris R
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naturepics43



Joined: 11 May 2015
Posts: 63
Location: Hocking County, Ohio , USA

PostPosted: Thu Dec 28, 2017 9:27 am    Post subject: Reply with quote

Larger image looks really good. If I may ask, what magnification and step size did you use.

Thanks,
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Smokedaddy



Joined: 07 Oct 2006
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Location: Phoenix, Arizona

PostPosted: Thu Dec 28, 2017 9:35 am    Post subject: Reply with quote

ChrisR wrote:
Somewhere I have one of those cans I made a mess of with a hacksaw..


... I could of easily placed a piece of fine sandpaper on a surface plate and removed the cap. I have a tendency of over doing just about everything I do. <g>

-JW:


Last edited by Smokedaddy on Thu Dec 28, 2017 9:37 am; edited 2 times in total
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mawyatt



Joined: 22 Aug 2013
Posts: 1118
Location: Clearwater

PostPosted: Thu Dec 28, 2017 9:36 am    Post subject: Reply with quote

Smokedaddy,

Large 6' square light tables with grids, wrapped with Rubylith sheets and drafting tools were the norm way back then, long before computers came into play Rolling Eyes

Chris,

Op Amps, or Operational Amplifiers, were/are a fundamental building block for analog computers, originals were built with tubes. They got their name from operational analog computations including summation, integration and differentiation, this was relatively easily with these devices. Burr-Brown and Philbrick are companies that come to mind in the early days of Op Amps.

Best,

Mike
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Smokedaddy



Joined: 07 Oct 2006
Posts: 828
Location: Phoenix, Arizona

PostPosted: Thu Dec 28, 2017 9:51 am    Post subject: Reply with quote

mawyatt wrote:
Smokedaddy,
Large 6' square light tables with grids, wrapped with Rubylith sheets and drafting tools were the norm way back then, long before computers came into play Rolling Eyes


I was a manual draftsman in a few disciplines for 20 years or so up until I got involved with AutoCAD in the late 80's.

On another note, I would love to know how to intricately etch brass or aluminum cylindrically. I've been trying to find specific (like exact) directions for quite a few months. I did read about using PNP Blue but nothing intricate or cylindrical objects.

-JW:
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Smokedaddy



Joined: 07 Oct 2006
Posts: 828
Location: Phoenix, Arizona

PostPosted: Thu Dec 28, 2017 9:59 am    Post subject: Reply with quote

naturepics43 wrote:
Larger image looks really good. If I may ask, what magnification and step size did you use.


I didn't figure out the magnification but I'm guessing approximately 3x (I'm math challenged to a certain degree). I think it was 141 images at 0.01mm increments.

-JW:
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naturepics43



Joined: 11 May 2015
Posts: 63
Location: Hocking County, Ohio , USA

PostPosted: Thu Dec 28, 2017 11:20 am    Post subject: Reply with quote

Thanks for the info. That little lens does a really good job.
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Smokedaddy



Joined: 07 Oct 2006
Posts: 828
Location: Phoenix, Arizona

PostPosted: Thu Dec 28, 2017 11:27 am    Post subject: Reply with quote

naturepics43 wrote:
Thanks for the info. That little lens does a really good job.


I agree and probably even better results can be achieved with those with more experience than I have.

-JW:
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mawyatt



Joined: 22 Aug 2013
Posts: 1118
Location: Clearwater

PostPosted: Thu Dec 28, 2017 12:32 pm    Post subject: Reply with quote

Well, you've certainly got a good start with your Canon 35mm macro!! That 741 chip picture is great Smile
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