[MRCA] Mystery Project

[mstangelo at comcast.net]

If you want a historical transistor pick up a Fairchild 2N697. Fairchild's entry into the semiconductor market was the revolutionary silicon 2N696/2N697:

<https://en.wikipedia.org/wiki/2N696>

This was followed with the planar transistor process that make other processes obsolete and let to integrated circuit development.

My first QRP radio was a 2N697. I still have it but I don't know if it is a Fairchild part. I believe it was made by texas Instruments.

Mike N2MS




> On 04/26/2023 8:42 AM Ray Fantini <rafantini at 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
>