[MRCA] Mystery Project

[Mike Feher]

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 at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of Ray Fantini
Sent: Tuesday, April 25, 2023 9:07 AM
To: B. Smith <smithab11 at comcast.net>; Military Radio Collectors Association <mrca at 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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