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Soldered 0805 vs 0603 vs 0402 vs 0201 vs 01005 vs 008004 today :)

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nanofrog:

--- Quote from: TheDane on October 22, 2017, 01:30:35 pm ---Besides the price, what should one be on the look out for to detect the fakes?

Are they total crap, just the best of el-cheap'o tweezers - or are they actually usable in a pinch?
Thanks

--- End quote ---
I'd say they're usable if you're not using a microscope (FWIW, I have a 3.5x - 90x Amscope Simul-focul ). That said, the one's I'm familiar with have a wire brushed finished to them.

schmitt trigger:
Just when one starts to believe that they cannot make the components any smaller, the manufacturers will prove you wrong.

Is there an equivalent dictum like "Moore's law" for SMT components?

TheDane:

--- Quote from: schmitt trigger on October 23, 2017, 02:34:45 am ---Just when one starts to believe that they cannot make the components any smaller, the manufacturers will prove you wrong.

Is there an equivalent dictum like "Moore's law" for SMT components?

--- End quote ---

Components are really extinct today, actually - to the naked eye, they're gone. Inside the PCB....  :scared:
https://www.pcbway.com/blog/Engineering_Technical/Impact_of_integrated_passive_components_on_PCB_technology_development.html

http://www.electronicdesign.com/embedded/use-embedded-components-improve-pcb-performance-and-reduce-size

There's a lot of info on the internet about 'removing' passive components on the PCB. Makes reverse-engineering a whole lot harder, and performing service as well.

hmm... must be a reason why Altium can do a 3D board view inside the pcb  :o
- thanks Dave, oh - can you do a video on how the industry deals with 'em gone passives?

TheDane:

--- Quote from: Howardlong on October 22, 2017, 10:27:00 am ---
There's a lot to learn.

--- End quote ---

Thanks for doing such awesome work on your video!
The switching between views made it much more interesting, and I enjoyed watching the entire thing - great work!

Coffee is no good for small high precision soldering  :-+

Superglue is also a no good thing - at all, at least on my desk and work area.
I noticed that you splosh a lot of it on your wise in the beginning, and later on it seems you're dragging it all over the bench when you gather samples, move your tools and so on.
It takes a long time to cure, is my experience only the outer layer hardens, so whenever I am forced to (supe)glue something - I just add a drop of water on top of component/pcb, and a few secs later I suck up excess water with a q-tip - and though the glue usually turns white, it can often be handled instantly afterwards.

I have some old flux that has dripped down the side of the dispenser and the fluids evaporated. It is sticking like there's no end to it. I find it easier to scrape a tad bit off, and let it hold the component to the pcb/workarea. When the component is soldered, it usually sticks in place as the flux already is solid.
Cleaning afterwards, as you clearly show is needed - it stops electrolysis of the flux components and contaminants acting as conductors - that's my understanding of why its bubbling. Alcohol (flux) is carbon, oxygen and hydrogen bonded together, so it seems to me that it is degassing through electrolysis - and stops when you remove power.

Yes, there's a lot to learn - thanks for letting me watch your work. I hope you can use my feedback.
/Egon

Btw - it seem your logic input pin is very close to shorting to the VCC/GND pin, at the edge of the pad between your soldering via's. I know the viewing angles can be tricky, and it works.
Big round of applause - you didn't say anything about a loosing a component.    :-//  :-+ :-+ :-+ :-+ :-+

schmitt trigger:
Thanks TheDane for your informative links.

This technology is hybrid circuit manufacture on steroids.

Back in 1986, in the company I used to work, we incorporated a hybrid design in our product. The learning curve was steep, and during the first year of manufacturing there were lots of scrap.

What was state of the art back then, it is a trivial matter nowadays.

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