I have some solid state operational amplifier modules which I think are from the early 60's, mostly Analog Devices 108A and Philbrick/Nexus SA-1.
Are these useful for anything, or are they just relics of the past?
Are these useful for anything, or are they just relics of the past?
They are useful but kind of archaic. You can do the same with a tiny chip.
I still have a shutter speed meter I designed and built years ago with one of those potted modules. It still works.
I still have a shutter speed meter I designed and built years ago with one of those potted modules. It still works.
Are they any good for line level audio applications?
Maybe I should just rig one up and see for myself. 😕
Maybe I should just rig one up and see for myself. 😕
Those where used in industrial control equipment. Some of the have very good DC characteristics. Some are low noise.
I even had one Burr-Brown that was doing modulation/demodulation of the DC in order to amplify it in the AC domain.
I even had one Burr-Brown that was doing modulation/demodulation of the DC in order to amplify it in the AC domain.
Hmmm, can't find a complete pinout for these and they aren't labeled.
I guess it's called a "2520" form factor first used by the Philbrick PP65. 😕
I guess it's called a "2520" form factor first used by the Philbrick PP65. 😕
If it's a Philbrick you might contact Bob Pease, who recently retired from National Semiconductor and loves those old units. He used to work at Philbrick.
Google his name. He lives in Northern California I think.
Google his name. He lives in Northern California I think.
Bob Pease - a very interesting character. Smart too.
Comments invited! czar44@me.com
—or:
R.A. Pease, 682 Miramar Avenue
San Francisco, CA 94112-1232
Comments invited! czar44@me.com
—or:
R.A. Pease, 682 Miramar Avenue
San Francisco, CA 94112-1232
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