Power Supply for Home lab?

The Main reason folks build there own is first and formost for the experiance  (Kinda New EE 101) , it can teach you a whole load about electronics, OpAmps, Power Transistors, Feedback, Transient Response, Voltage References, Temperature stability to name just a few and at the end of it you have something usefull

The second reason is because you have a few of the expensive parts laying arround already and there just the ticket to build a PSU on a budget, Im talking about perhaps a transformer from an old AMP, got a box to put it in, have an LCD or LED display to show the volts and amps (Or an analogue one) etc. Then the cost is minimal for the rest and you still get the benefit of learning and something usefull

If the reason you need one is purly professional / Must have one for the hobby but are an experianced EE then yes, often much cheaper to simply buy one, albeit low end.

My series on building one is aimed at the folks wanting to learn and gain the experiance, and now im going to extend this to making it fully programable, even remotly so it will potentially be comparable with ones exceeding many hundreds of dollars.

Peter

You can't go wrong with an LM317 operating in Linear regulation mode!

Making its voltage programmable is as simple as incorporating a I2C/SPI/Serial controlled resistor.

Thanks for the great post!

As a Autodidact I found that it was important to understand differential calculus in multiple dimensions.

Faraday couldn't express his findings empirically and got stuck.  James Clerk Maxwell was able to express Faraday's findings as simplistic complex equations (It sounds like an oxymoron but it's not) to make it easy for the rest of us to understand it.

@DAB is working on his own theories of everything. Its very interesting stuff.

I wouldn't be surprised if in the future we find that the cosmic background radiation is caused by all of our wifi transmissions that won't fade over time.

As for computer design, Tommy Flowers doesn't receive enough credit.

To Compact:

I hope your are feeling Better today.

WRT Faraday & Maxwell, I heard about that, on how Maxwell (as in Maxwell's E-M Equations) expressed Faraday's Theories/Ideas.

WRT2 F&M. Being able to bridge STEM (Science Technology Engineering Math) Subjects to the Public, is difficult. Try to get to

www.wnyc.org -Shows -Leonard Lopate Show -Search "Neil deGrasse Tyson" There was a short segment about the intersection of Science (STEM) and Public Policy. I wish NdeGT would run for POTUS (President Of The US) , he is "Light Years ahead of any of Fools currently running" [Pun Intended]

What is @DAB?

IDK (I Don't Know) about WiFi possibly contributing to Cosmic Background Noise. It (WiFi) is a pretty weak signal compared to TV/Radio, as was the basis for the Movie "Contact". Planck's Equation E=hc/(lambda: wavelength) Sorry, I could not find a (lambda) in the Equations Editor. Lambda for WiFi May Not be small enough to

make (E) Large, b/c Lambda is in the Denominator. This is a First Impression, so I may be Wrong.

I treasure these discussions w/ you. Thx. I hope we are not straying too far off-Topic, causing other contributors to be Bored. My Apologies in Advance.

-USCDADNYC

This is DAB! http://www.element14.com/community/people/DAB

Accumulate all the WiFi transmissions along with Microwave Oven cooking and you get a hell of a lot of power!

We advertise Lamb(da) for Australia Day!

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Actually, the CBR is caused by stars.

When a star begins to fuse material, it creates high frequency photons.

As time passes, the photons become lower frequency as they have more mass.

Contrary to popularly stated theory, a star is very old by the time it produces visible and IR photons.

DAB

To the all the bloggers on this Thread, I implore you all again to provide a little info about yourself. Maybe just Town, Country, Approx. age (ex: Baby-boomer, millenials, etc). This in order for ALL of us to tailor our comments to the Target Audience.

Case in Point is my Reply to DAB, about CBR.

To DAB: I spent some time at AT&T Bell Labs in the early 1980's, this maybe 3 years after Scientists Penzias/Wilson won the Nobel Prize in Physics in 1978 for work on CBR. I was more on the implementation/field-testing than Pure Research of P&W. Smart People but suffered from NIH syndrome (Not Invented Here). If it was not done at Bell Labs it was No Good. Talk about Hubris. Where is AT&T Bell Labs today?

DAB wrote>>...As time passes, the photons become lower frequency as they have more mass.

ELY reply>> Does this gaining Mass have anything to do w/ the Higgs Boson?

AAR this was also to demonstrate how I could have abbreviated/expanded on my reply based on more info about my Target Audience. Anybody outside the USA, even know what AT&T stands for? Or do they know Bell Labs?. Context is everything, please provide me w/ context. If you are in a country using the Metric System, I will use Metric Units and the Centigrade Scale. Please help me to provide better tailored info.

Full Disclosure: Edward Yee is my real name, aka USCDADNYC, aka ELY. Lives in NY NY  USA, Baby-Boomer. You can even find my phone/physical-addr by vetting thru the Website: www.uspto.gov

AT&T = Yankee Phone and Morse!

As for me I'm fair'n'height! and I'm no criminal so I don't use Con Text either.

Centipedes use Centigrades and Centimetres!

Hi Edward,

It sounds like you had access to some really neat projects.

I am a disabled/retired systems engineer with an extensive physics background.

Over the last four years or so, I used complex problems as a way to distract my brain from the pain caused by my injury.

During that exercise, I found a very simple way for the universe to work, which I documented in my book "I Killed Schrodinger's Cat!"

I have not found any need for the Higgs or any other Boson to make the universe work.

I have documented a stellar fusion process that creates photons as part of the sequence at each level of fusion.

As the star makes more massive objects, these are entangled to produce photons, so the more massive/lower frequency photons are created as the fusion process progresses.

If you are interested, I love to talk about the processes I have defined.  My coauthor and I are still working on the theory and we are currently redefining the Periodic Table as we have found a better way to account for what is inside of atoms.

So far we have identified photon exchange as the main way for atoms to exchange mass and energy, which confirms thermodynamics measurements, but eliminates the need for entropy.

DAB

Hi Edward,

I too am a retired due to illness.

Unlike DAB who is very clever I just make pot luck guesses and also try to add a bit of levity to get through my days.

I'll make pot luck remarks such as;

  "DC is just AC with a very low frequency!"

But unlike Tesla I won't make statements like;

  "c = infinity" (until it is proven or disproven.)

Very Compact (or Very Expanded) depending upon which part of the Universe we're in.

(By my definition - Multiverses are encompassed in a single Universe!)

A bit like a Venn Diagram!

The net effect would be "Quantum Physics without dice" but without everything being deterministic!

A photon is a dumpling served in a Vietnamese soup.

A dumb cow is an oxymoron

A dumb cow is an oxymoron

IDK (I Don't Know) about Photons possibly having Mass? At certain Levels/Situations Matter/Energy are interchangeable (E=M^C2 ). I guess I should continue that MOOC QM course I started  at www.coursera.edu. the QM course offered by the USA university of Maryland. I got as far as the Time-dependent Schrodinger Equation. But stopped b/c #1) I had got my Answer to the Q: Why QM? A (being): small semiconductor geometries are subject to QM Effects. #2) The math was getting Hairy and I suddenly remembered that I had given away my Math Bible, Krezszig "Advanced Engineering Mathematics" ^C2 . {sorry about the artifact, I am slowly starting to use the Equations Editor). W/O much success as evident by my mistakes here.

AAR Thx for posting the Ponder(ables)/In-Ponder(ables) to which I may/may-not be able to add to the discussion.

USCDADNYC, , NY NY USA

Kreyszig  - I'm keeping mine just in case - which shows what a hoarder I am since I have opened it exactly once with the intention of looking something up in the last 42 years !

MK

To MK:Was your edition of AEM "red" in color and about 6.5"x9.5"x2.5" (17x24x6cm). How I miss that book, I guess I can get a copy over the Internet.What book did you have for Fresh/Soph General Physics? What Calculus Text? US or outta country Higher Ed institution? I was BSEE 73' Syracuse University, JD 1990 NYLS.

You might saw I went from a 2nd Rate Engr School to a 3rd Rate Law School. My trajectory is definitely downward.

WRT "Hoarding", I take an approach similar to the NYS EPTL (Estates Powers, Trust Law) by analogy. You cannot execute a "Will" w/o knowing the metes & bounds of your Personal/Real (land) Property. Similarly, if you know what you have and can show a compelling reason to "keep" such, in my eyes, it is Not Hoarding. IDK about in other jurisdictions outside of NYS (USA), but this is pretty much English Common Law based. So you guys/gals in NZ and/or Aussie Land are covered

BTW anybody else going to participate in that "power electronics" MOOC at www.coursera.edu? We can use this forum to exchange Q's/comments. And maybe

exchange "GOOD" (if at all possible) Puns/Jokes. LOL

Hi Edward,

Unfortunately, E = mc^2 does not mean matter and energy are interchangeable.

This is a often repeated but wrong interpretation of what Einstein really said.

The full context of his equation says that the maximum kinetic energy E of a mass object m occurs when it is travelling at the speed of light c.

Mass and energy are separate items and both are 100% conserved in all reactions.

The equation also indicates that there can be NO massless sources of energy.

So the faster a photon vibrates, then the less mass it has.  This fact means that Planck's radiation law is wrong as he has higher frequency photons with more energy, which is not confirmed when you include the mass.

So if you are going to use Quantum Mechanics, you first need to throw away all of your massless objects and replace your discrete quanta as individual photons.

Oh and by the way, the standard atomic model is also wrong.

DAB

Seven!

It's my cat playing dice again!

DAB wrote>>...

Unfortunately, E = mc^2 does not mean matter and energy are interchangeable.

This is a often repeated but wrong interpretation of what Einstein really said.

The full context of his equation says that the maximum kinetic energy E of a mass object m occurs when it is travelling at the speed of light c.

ELY reply>> Forgive my stating the special case of Einstein's Famous Equation. Where v is negligible when compare to c. My bad.I guess I should stated the formula as: [having tbl w/ the equation editor, so this longhand] E = (M x c(sqrted)/ Sqroot (1- ( v(sqrted)/c(sqrted)). Is this what you are alluding to?

AAR I had to open up my Atomic Physics Text from Fall 71 or Spring 72 for this one

AAR2 I have just about exhausted my knowledge of (atomic/relativistic) Physics. Maybe I should proceed ahead (from where I stopped) WRT that QM MOOC. Could you (DAB) look at the curriculum to see if any of the concepts are worthwhile. Link is: https://www.coursera.org/course/eqp

Will any of this gobbly-gok help me understand what is behind the science/math of your Premise(s)/Theories ? Not to slight you, but I would prefer a Third Party Source for the Basic Science involved. Can you refer me to a "Mainstream" Source? I don't want this to become  a  PHD level learning experience. Just the Basics, if at all possible.

Two!

Cat's Eyes!

The cat's at it again!

As a forearm to the head - Ancient Egyptians measured Qubits in Cubits.

Both QEIIs are World renowned wave motion experts.

One QEII has no power and only reigns.