Electronics > Beginners
It's not easy being a beginner........
Noidzoid:
--- Quote from: RoGeorge on October 15, 2019, 06:10:14 pm ---When it's online info, chances are the material has no peer review, so less trustful.
When it's paper printed, almost sure the material was peer reviewed, so chances are the book is correct, even when it defies common sense.
That's a good reason to search if there are Allen keys with different head profiles. Turned out square Allen keys exist:
https://duckduckgo.com/?q=square+allen+key&iax=images&ia=images
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The definition was primarily of "Hex" followed by "(also called Allen)". So I'm sorry but as much as I appreciate your reasoning I cannot agree with you. In this case, Hex was used, as was Allen therefore I don't think it unreasonable to assume the item in question is a Hexagonal Allen. (Did I learn my shapes wrong in primary school?)
I am well aware of most of the different shapes that have been forged or machined onto the ends of allen type keys , including mass produced and ones I have had to make myself for specialist applications.
I believe the name "Allen" being taken from the Allen Manufacturing Company (bought out with various setups since) who registered it as a trademark. The correct name for the tool made by any other manufacturer is Hex/Hexagonal Key, but in the same way that we call vacuum cleaners hoovers, the same applies in this situation.
A square allen key is therefore not technically an allen for two reasons, just a plain old square drive key, and not even that would be called "squarish" (with the possible exception maybe a one off having to be made for a special situation).
I am more than happy to be educated if any of what I have just written is incorrect but submit this post as being correct to the best of my knowledge.
Never too late to learn new things, which is also what I am trying to do here and elsewhere with electronics.
Noidzoid:
--- Quote from: vk6zgo on October 15, 2019, 04:18:39 am ---
Yeah!
Good to see your BS meter is working well! :bullshit:
The glossary statement was "double dumb"!
"Hex" in the electronics sense, is more likely to refer to "Hexadecimal" or sometimes just "six" as in things like "Hex Inverters"
(I aways felt the latter device sounds more like something you would need for self defence if you upset a Witch!) ;D
The bit about "high" digital voltage levels is BS, too---- the range of voltages which are read as "ones" or "zeroes" are different for the various types of technogy used to manufacture digital ICs, & normally are included in the device "spec sheet", but a "high" is never just "any value above zero"!
Edit:- Oops! In my eagerness to get to my "witch" joke, Ialso misled you.:-[
I have added the part in italics to clarify things!
--- End quote ---
Ha! Love Hex inverters, I always take one when walking in the woods late at night! :-DD
But seriously, you have just illustrated my point and highlighted my concerns, as I would in fact have read the next entry in the glossary without knowing it was wrong.
Noidzoid:
--- Quote from: rstofer on October 14, 2019, 09:53:02 pm ---Try this book "Getting Started In Electronics" by Forrest Mims:
https://www.amazon.com/gp/product/0945053282/ref=dbs_a_def_rwt_bibl_vppi_i0
You'll get nowhere unless you do some experiments. It's easy to read and forget; if you want to remember, do an experiment.
Grab a battery, some resistors and a DMM. Verify Ohm's Law! Sure, it's boring, but it is vitally important to know how voltage dividers work. And everything else we do with Ohm's Law without even thinking about it. Have the three forms down cold! Then add in the power equations. If your resistors self-destruct, you'll have some idea why. P = E2/R or I2*R or I * E so power goes up quickly with either voltage or current. But of course, voltage and current are tied together with Ohm's Law.
Get this stuff down pat and you have a leg up when it comes to circuits. We spent a LOT of time on Ohm's Law in EE school.
One problem with Mim's book is that he starts out using electron flow (page 20) while the rest of us are using conventional current flow where the current flows from plus to minus while the electrons (about which we seldom care) flow from minus to plus. I didn't look to see if he changes that when he gets to circuits. Just something to be aware of.
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Thanks for this, I will be sourcing this book asap. :-+
StillTrying:
It's a good idea to learn how to do images as well. :P
10 kB version instead of 2 MB and 4160 pixels.
Noidzoid:
--- Quote from: StillTrying on October 15, 2019, 09:28:47 pm ---It's a good idea to learn how to do images as well. :P
10 kB version instead of 2 MB and 4160 pixels.
(Attachment Link)
--- End quote ---
I see. Thank you kindly :-+
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