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.

Correction."Yellow on the Outside. White on the Inside." Sorry. My Bad.

I would never call you the possibly derogatory term "Banana" although in New Zealand there are some persons who are proud to be called Bananas and have a dedicated organisation that has conferences.

http://www.goingbananas.org.nz/

If you are calling yourself a banana I'll call myself one too.

I'm yellow on the outside and inside and have many black bruises (due to illness).

I've seen Metre meters!

A USA resident using Metric - How rare!

It must get interesting when you're talking mils and mms (also pronounced mils).

Also did you know a US Pints are different to UK Pints!

I'm in two locations at the same time when you're not looking at me. If you try to look at me I'll suddenly be seen in either place (but since I'm transient I'm always moving around).

As is a US Gallon and a UK Gallon, threw me for years when trying to figure out my cars MPG....

Compact wrote>>...

I'm yellow on the outside and inside and have many black bruises (due to illness)...

.A USA resident using Metric - How rare!...

Also did you know a US Pints are different to UK Pints!

ELY reply>> Sorry about your Illness, I hope you are Better now. I am 64years old and am "Strong as Bull","Smell like one too" and "I am full of Bull". What killed Metric Conversion in USA was the (scientific) Calculators. I miss those Ms. Metric Calendar Pin-Ups where the girl in the Bikini's measurements were expressed in Metric units. I knew vaguely about the difference in US/UK Pints. But being a Tea-toltaller (sp?), I did not have many opportunities to "raise a Pint" in either the US or Great Britain.

Many thanks for your good wishes. Me being transient is posting this message from a Cancer Clinic.

Yes, I'm really as soft as a ripe banana!

LIfe is the journey and not the destination. My support is making it as pleasant as possible.

Sort of Good News. www.coursera.org is running the Univ Of Colorado's Power Electronics Series again(?) staring 25JAN16. I think it starts w/ the first of six courses which can lead to a Specialization Certificate. There is Tuition for the Certificate. But if you forgo such accolades, it is FREE. I think just "auditing" the first Course will be sufficient to satisfy my Curiosity. I have two higher-ed Degrees already. One person said to me: "If you get any more Degrees. You will become a Thermometer." As a Patent Atty, I rather give a witness the 3rd Degree, than receive anymore Degrees myself. So Check It Out. At the site Key-on: "power electronics"

USCDADNYC

Being an Autodidact I have at least 3 degrees of freedom! - XY and Z (Cartesian) or  theta, rho and phi (Spherical)

Being an Autodidatic, you should love the Movie "Good Will Hunting." I can go only so-far w/ complete (un-directed) Self-Study, I hit a road-block and I can be stuck for Days (even) Years. MOOCs are a little better, at least you can ask Q's of the Instructors. For me, I am playing in the "sand-box", WRT MOOC's, more for Intellectual Curiosity than attaining a Academic Goal. Of course some of my Interest wanes when it Math gets difficult. I watched a Quantum Mechanics MOOC even though I had Atomic Physics over 40 years ago. I wanted to know what the Buzz, QM was about in today's world. (small semiconductor geometries are subject to QM effects). I took a Thermodynamics MOOC, although I had Physical Chemistry "101", etc

For those NOT in the "Sand Box", but are studying  (for Real) or Have Kids that are actual Students, I have some Tips:

1. Make your own Study Notes. Don't rely on somebody else's Note. If you create the Notes, you remembers the Notes

2. Try to have a Study Partner who is your equal. People of Disparaging academic talents can bring you down. But if your Study Partner is Good-Looking, it is OK.

3. [I am Not a Shill for the House] but WRT #1, BUY a hand-held OCR Scanner (like Ectaco C-Pen, OR Iris(pen), etc.). you can copy directly from your Printed Textbook into your Office-like Applications. But although these devices make it real Easy to incorporate Book-matter to your Notes, you still have to be Judicious in what you Scan (copy).If you Yellow "HighLight" everything. You are HighLighting Nothing.

4. Keep in mind the Saying "Do not Schooling interfere with your Education"

-USCDADNYC

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

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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