60's era op-amp modules?

theAnonymous1 · 20th May 2010, 03:14 PM

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?

bob91343 · 20th May 2010, 06:16 PM

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.

theAnonymous1 · 20th May 2010, 06:32 PM

Are they any good for line level audio applications?

Maybe I should just rig one up and see for myself.

SoNic_real_one · 20th May 2010, 06:51 PM

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.

theAnonymous1 · 20th May 2010, 07:15 PM

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.

bob91343 · 20th May 2010, 10:49 PM

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.

Enzo · 21st May 2010, 04:39 AM

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

20th May 2010, 03:14 PM	#1
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	60's era op-amp modules? 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? __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

20th May 2010, 06:32 PM	#3
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	Are they any good for line level audio applications? Maybe I should just rig one up and see for myself. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

20th May 2010, 07:15 PM	#5
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

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20th May 2010, 06:16 PM	#2
bob91343 diyAudio Member Join Date: Mar 2010	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.

20th May 2010, 06:51 PM	#4
SoNic_real_one diyAudio Member Join Date: Jan 2008 Location: Virginia	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.

20th May 2010, 10:49 PM	#6
bob91343 diyAudio Member Join Date: Mar 2010	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.

21st May 2010, 04:39 AM	#7
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	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

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