# Need help with an op-amp circuit

**URL:** <https://boards.straightdope.com/t/need-help-with-an-op-amp-circuit/1016787>\
**Category:** Factual Questions\
**Created:** [April 8, 2025, 8:55am UTC](https://boards.straightdope.com/t/need-help-with-an-op-amp-circuit/1016787 "2025-04-08T08:55:28Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![Dr.Strangelove](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/dr.strangelove/32/6613_2.png) [@Dr.Strangelove](https://boards.straightdope.com/u/Dr.Strangelove)\
**Post date:** [April 16, 2025, 9:09pm UTC](https://boards.straightdope.com/t/need-help-with-an-op-amp-circuit/1016787/21 "2025-04-16T21:09:09Z")

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Thanks, now I’ll forever think of it like that! Just like how I always thought of **puzzlegal** as **puzzle gal** until she mentioned it gets misread as **puzz legal** , and now I always think of it that way.

As for the project, I’m currently in the process of re-learning Eagle for the fifth time so I can fab a little PCB. There is something about that UI that just never sticks. It doesn’t help that the part libraries are so small. I seriously don’t understand why there isn’t some central repository for every part ever made. I should not be having to create a custom library for parts that have been around since 1979.

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**Author:** ![Spectre\_of\_Pithecanthropus](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/spectre_of_pithecanthropus/32/12343_2.png) [@Spectre\_of\_Pithecanthropus](https://boards.straightdope.com/u/Spectre_of_Pithecanthropus)\
**Post date:** [April 16, 2025, 9:15pm UTC](https://boards.straightdope.com/t/need-help-with-an-op-amp-circuit/1016787/22 "2025-04-16T21:15:11Z")

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> [@Dr.Strangelove](#):
>
> Thanks, now I’ll forever think of it like that! Just like how I always thought of **puzzlegal** as **puzzle gal** until she mentioned it gets misread as **puzz legal** , and now I always think of it that way.

Thanks right back atcha, same reason!

I had no idea, because the “puzz” part of the name is unusual.

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**Author:** ![Marvin\_the\_Martian](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/marvin_the_martian/32/2898_2.png) [@Marvin\_the\_Martian](https://boards.straightdope.com/u/Marvin_the_Martian)\
**Post date:** [April 17, 2025, 2:59am UTC](https://boards.straightdope.com/t/need-help-with-an-op-amp-circuit/1016787/23 "2025-04-17T02:59:53Z")

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I have been using KiCAD for years when making boards for work (including some eight layer controlled impedance designs). Does everything I need with a relatively easy UI. Plus the price is right.

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**Author:** ![Dr.Strangelove](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/dr.strangelove/32/6613_2.png) [@Dr.Strangelove](https://boards.straightdope.com/u/Dr.Strangelove)\
**Post date:** [April 17, 2025, 3:03am UTC](https://boards.straightdope.com/t/need-help-with-an-op-amp-circuit/1016787/24 "2025-04-17T03:03:19Z")

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Been thinking about that. The nice thing about Eagle is that it’s now integrated with Fusion, which I use for other things (and is also free at the hobbyist level). And I have used it before, so I’m not learning it _entirely_ from scratch. Still… maybe I should make the jump to _actually_ free software.

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