Integrated Op Amps - the early days

RE: Integrated Op Amps - the early days

javagoza — Sun, 27 Feb 2022 20:21:14 GMT

Good collection.

I still have the some amps I bought when I was a teenager.

This LM741 from an FM transmitter

This TDA2002 from an FM receiver

RE: Integrated Op Amps - the early days

Jan Cumps — Sun, 27 Feb 2022 19:14:39 GMT

we would use Motorola MECL digital ICs and would bias the power supply so we could use them as linear small signal differential amplifiers

That would make a great Project14 entry

RE: Integrated Op Amps - the early days

beacon_dave — Sun, 27 Feb 2022 19:12:47 GMT

For those still not too sure about this IC m'larky... [emoticon:c4563cd7d5574777a71c318021cbbcc8]

The XL741 Discrete Op-Amp Kit:
https://shop.evilmadscientist.com/productsmenu/762

RE: Integrated Op Amps - the early days

scottiebabe — Sun, 27 Feb 2022 18:12:04 GMT

What a great collection of integrated op-amps! I do have a 1970's LM308 that is in a ph/conductivity meter I bought at a junk sale for a few dollars.

Interestingly it is paired with a matched 2n5909 JFET frontend:

Wonderful photo!

RE: Integrated Op Amps - the early days

jc2048 — Sun, 27 Feb 2022 18:06:42 GMT

The ceramic packages are interesting. Perhaps they were internal engineering samples that escaped to the wild.

The oldest ones I can find are these LM301AN parts with a 1981 date code. I'll try them out and see if they still work. They don't have internal compensation, so perhaps I could try experimenting with compensation techniques, or something like that.

RE: Integrated Op Amps - the early days

shabaz — Sun, 27 Feb 2022 17:17:15 GMT

Great photo!

Very interesting seeing the 741 also came in a 14-pin DIP package.

RE: Integrated Op Amps - the early days

genebren — Sun, 27 Feb 2022 16:02:27 GMT

Cool collection of early parts. I might have to dig around in my collections in the garage to see if any of my early Op-Amps have survived the years and multiple moves.