Stuff you want to see explained in a short video - Page 1
Forum section: electronics / general

author: free_electron
author_rank: Super Contributor
timestamp: November 14, 2013, 08:05:50 pm
content: This is a topic to post your requests for explanations of things you struggle with.If i can make a short video about it i will publish it here.Sort of a fundamentals friday , but open for all.Fire away

author: dr.diesel
author_rank: Super Contributor
timestamp: November 14, 2013, 08:17:05 pm
content: How do I keep electrons from pilling up on the floor under my wall sockets?(I tried stuffing them back in with a butter knife, didn't work out)

author: JohnnyGringo
author_rank: Regular Contributor
timestamp: November 14, 2013, 09:00:04 pm
content: Time Constant circuits. i.e. RC

author: GreyWoolfe
author_rank: Unknown
timestamp: November 14, 2013, 09:09:57 pm
content: Dr Diesel, did you forget to duct tape the sockets closed after you stuffed the electrons back in? It always works for meTom, NW0LF

author: miceuz
author_rank: Frequent Contributor
timestamp: November 14, 2013, 09:22:48 pm
content: Semi - high speed PCB routing - no GHz hardcore, something as "trivial" as 100MHz. Since all those high speed ARM micros are widely available, this becomes quite a topic - how do I route my 50MHz SPI bus.

author: free_electron
author_rank: Super Contributor
timestamp: November 14, 2013, 09:47:43 pm
content: Quote from: miceuz on November 14, 2013, 09:22:48 pmhmmm... this has more to do with termination

author: marshallh
author_rank: Unknown
timestamp: November 14, 2013, 10:00:43 pm
content: General transmission line theoryMultiphase buck convertersGroup delay/dispersion in microstrip vs striplineOK asking a bit much, but there's a lot of academic info but less practical

author: free_electron
author_rank: Super Contributor
timestamp: November 14, 2013, 10:21:55 pm
content: i don't do theory. no formula's !transmission lines are very math heavy ..switching regulators looks like an interesting topic. many people have trouble with that...pcb routing for fast signals ( actually this is more a termination problem. the chips handling really fast signals have internal termination on board... )that is interesting stuff. i can cover some transmission line stuff in there.The kind of topics i'm thinking about is the stuff that keeps recurring on the forum. basic stuff that anyone should be able to do , yet still the questions keep coming...opamps is another such topic.

author: c4757p
author_rank: Super Contributor
timestamp: November 14, 2013, 10:28:55 pm
content: Magnetics!OK, I know this is a vastly complicated field. But basic things like selecting inductors for DC-DC converters, etc. Especially when many of the datasheets don't really tell you much. I'm starting to catch up now, but I'd still love to hear about it, and I've seen tons of questions about DC-DCs that ended up with "that's a poorly chosen inductor".

author: dr.diesel
author_rank: Super Contributor
timestamp: November 14, 2013, 10:54:54 pm
content: Quote from: marshallh on November 14, 2013, 10:00:43 pmSeparate subject, but I could put something together on utility line transmission?

author: Dave
author_rank: Super Contributor
timestamp: November 14, 2013, 11:24:09 pm
content: I would love to see this explained:Quote from: Rerouter on May 11, 2013, 08:27:41 amIt's a subject that many struggle with (can you count how many people had problems with oscillating constant current loads?).

author: free_electron
author_rank: Super Contributor
timestamp: November 14, 2013, 11:53:19 pm
content: Quote from: Dave on November 14, 2013, 11:24:09 pmthat is not doable. it depends form circuit to circuit. you need to analyse the complete circuit in detail. there is no checklist to solve such a problem.

author: Flump
author_rank: Frequent Contributor
timestamp: November 15, 2013, 12:04:28 am
content: how to calculate component values to make your own audio equalizersay two bands one low and one high300hz and 3k ?

author: GK
author_rank: Super Contributor
timestamp: November 15, 2013, 12:19:28 am
content: How about a video describing the ancient art of looking up and reading about shit in books.

author: Flump
author_rank: Frequent Contributor
timestamp: November 15, 2013, 12:31:32 am
content: books are so outdated

author: dr.diesel
author_rank: Super Contributor
timestamp: November 15, 2013, 12:38:27 am
content: Quote from: Flump on November 15, 2013, 12:31:32 amClassic theory/principle is not.Today's youth demand instant gratification, without the work...

author: Flump
author_rank: Frequent Contributor
timestamp: November 15, 2013, 12:55:00 am
content: some oldies doo too

author: Bored@Work
author_rank: Super Contributor
timestamp: November 15, 2013, 06:35:02 am
content: Quote from: GK on November 15, 2013, 12:19:28 amReading is for old people.

author: Galaxyrise
author_rank: Frequent Contributor
timestamp: November 15, 2013, 07:10:12 am
content: There are so many parameters to a component, and datasheets don't always list all the ones that might be important to a particular project! Could just choose an entry on a datasheet as a topic. An example I can think of seeing a couple of times recently is mosfet gate threshold voltage (example) Hfe & fT of a transistor? Not just what the term means, but how it can break your design when you forget to consider it.Almost anything where theory falls apart a bit in practice. You seem to have lots of tales of "paper engineers" missing practical realities (I seem to recall you mentioning the differences between types of capacitors as an example once); I suggest any one of them would probably make a nice short video. As I have extremely limited practical experience, I welcome such lessons.

author: Kryoclasm
author_rank: Regular Contributor
timestamp: November 15, 2013, 09:53:59 am
content: How to shoo all the electrons out from under my bed when I need them to do some work!

author: owiecc
author_rank: Frequent Contributor
timestamp: November 15, 2013, 12:56:46 pm
content: My request would be do not do basic stuff. Basic stuff is everywhere. Talk more about more advanced stuff. Go through a datasheet of a MOSFET and explain what all those Ciss-ess are for. How do you design a drivers for H-brigde and talk about the pitfalls that you can easily fall into (dv/dt triggered turn-on). Decoupling, Thermal management - how mouch power can you dissipate in a SMD mount LM7805. How much current can you push throug a 350mA LED in a short pulse. Failure modes of various component: tantalum caps, electrolytic caps, LEDs, diodes, MOSFETs, resistors and how this affects circuit design. Circuit protection undervoltage, overvoltage, power good, ESD protection. Impact of mechanical stresses on PCB and components. I am just throwing ideas here but I hope you see my point.