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

From: [email protected] <[email protected]> On Behalf Of B. Smith
Sent: Monday, April 24, 2023 9:47 PM
To: Military Radio Collectors Association <[email protected]>
Subject: [MRCA] Mystery Project

Mystery Project
Z