Originally published at: https://contextualelectronics.com/topic/csos-sketchplanation/
How a constant current sink works when an op amp and sense resistor is involved.
Hey Chris,
I’m in the apprentice program, finding in hard to figure out how to get at the good stuff. In this video you talk about op amps and the Benchbuddy. You advise to go and read up on op amps on the concept pages. Where can I find these?
Cheers,
Leon
Agreed, I’m having the same issue. It’s kinda hard to figure out which project to start with ETC. He seems to mention a lot of resources that I can no longer find…kinda difficult without the context. I was able to use different resources to learn a bit more about Op-Amps, but I wish this “Apprenticeship” was a little more self-contained.
Hey Julian (and Leon, since I never responded on here), I’m sorry to hear about that! Some of the references you’re talking about are a carryover from the old site (https://legacy.contextualelectronics.com). In the short term, the best solution I can give you is to create a login on that site. Would that help?
In the longer term I’ll be re-recording some of these videos to indeed be more self contained. I’ll audit the videos that are on here right now, as it’s been a while since i watched these videos and try to rectify any references that are awry.
Cool! That should probably help a bunch 
Looking forward to all the new content!
Cool, sent you an email with your login info.
If any CE members find this message later, the same offer stands.
Same thing for me, Chris. Can I get access to the older site as well, please?
(Also, Eagle is now only available as part of a Fusion 360 subscription, so that part of the CSOS project videos is irrelevant. And one other thing: the Arachnid Labs Reload Pro GitHub repo is now completely different, and doesn’t have a readable schematic PNG, so that’s also kind of confusing.) (EDIT: Got confused about the Reload Pro vs. the original Reload on GitHub! The Reload is still there and still the same as in the videos.)
Sent you a login
Thanks for the info about the CSOS! The stuff about EAGLE is a bummer…but is also a good reminder about why we’re using KiCad.
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