Thanks Ray, interesting stroll down #741 Memory Lane!   Remember the Philbrick Manifold? 
I built a 100/50/25 kc crystal calibrator as a school project that used those RTL logic chips.  Still works!
I had a professor (Nello Sevastopoulos) who was a principal inventor of the 3 terminal regulator at National at the time.  Interesting guy!
Tim
N6CC

On Wed, Apr 26, 2023 at 5:42 AM Ray Fantini <RAFANTINI@salisbury.edu> wrote:

According to Wiki, In 1963, the first monolithic IC op amp, the μA702 designed by Bob Widlar at Fairchild Semiconductor, 1968: Release of the μA741. The popularity of monolithic op amps was further improved upon the release of the LM101 in 1967, which solved a variety of issues, and the subsequent release of the μA741 in 1968. The μA741 was extremely similar to the LM101 except that Fairchild's facilities allowed them to include a 30 pF compensation capacitor inside the chip instead of requiring external compensation. This simple difference has made the 741 the canonical op amp and many modern amps base their pinout on the 741s. The μA741 is still in production, and has become ubiquitous in electronics—many manufacturers produce a version of this classic chip, recognizable by part numbers containing 741. The same part is manufactured by several companies.

 

There are a handful of components like the 2N3904, 555 timer and 78XX series regulators that are everywhere, but unlike many of the ubiquitous components that have come and gone like the 78XX series linear regulators that have all gone today being replaced by modern switching regulators the 741 op amps are still widely used.

 

Fairchild Semiconductor was a true leader in development and manufacture of analog integrated circuits, think there RTL logic chips were the basis of the Apollo guidance computer, already have one of those chips so now with the addition of a uA741 my Fairchild collection will be complete!

 

Ray F/KA3EKH

 

 

 

From: Mike Feher <n4fs@eozinc.com>
Sent: Tuesday, April 25, 2023 10:34 PM
To: Ray Fantini <RAFANTINI@salisbury.edu>; 'B. Smith' <smithab11@comcast.net>; 'Military Radio Collectors Association' <mrca@mailman.qth.net>
Subject: RE: [MRCA] Mystery Project

 

 

I thought it was crazy Bob Widlar who designed all those early ICs. I actually had a couple of beers with him back in the day. 73 – Mike

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

From: mrca-bounces@mailman.qth.net <mrca-bounces@mailman.qth.net> On Behalf Of Ray Fantini
Sent: Tuesday, April 25, 2023 9:07 AM
To: B. Smith <smithab11@comcast.net>; Military Radio Collectors Association <mrca@mailman.qth.net>
Subject: Re: [MRCA] Mystery Project

 

It’s a op-amp tester! Relies on almost all seven pin op amps like the 741 having the same pin configuration.  Think it’s one of those cards that use a RC time constant to flash one or both LED in a feedback circuit to make it oscillate. Wonder what the bottom pins on the zif socket do?  Or if you stuff a dual op amp like a 358 or a quad like a 324?

 

Sometimes think the LM741 may be the 6C4 of the linear world, they are good for everything. Not just amplifiers but also in filters, DC amplifiers and oscillators. Quick search on the internet shows that in 1968 Dave Fullagar of Fairchild developed the UA741, think it may still be the most popular op amp out there.

Would like to find one of those old TO-99 8 pin round op amps just to sit around and look at it!

 

Ray F/KA3EKH

 

 

 

 

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