Film capacitor as power-supply filter

---------------------------------------

** More of JL's fake wisdom plus a context shift = complete nonsense.

FYI to all:

In nearly 20 years I have not seen even ONE original design posted here, complete with schematics, photos and justifications for each component choice and topology used. So I am not gonna be the one to break with that grate tradition.

Cos that is NOT what this NG is for.

Folk, mostly trolls and students, come here with design QUESTIONS riddled with ambiguities and false assumptions.

They get a lot of terrible replies and few good ones - but are unable to separate the wheat from the chaff.

Most never come back - good.

I've done numerous project and other special designs, 8 of them published in Australia's leading electronic magazine for payment. Then the mag collapsed in 2002.

Me let JL and his ilk pour scorn and invent fake issues with them ?

Not Bloody Likely.

..... Phil

I've posted scores of original schematics, and scores of photos of real stuff I've designed, and scores of Spice sims. Others have posted, freely given away, as many. Have you seen Win's HV amps, or Phil Hobbs low-noise circuits, posted recently?

I don't furnish detailed "justifications"; I assume that competent engineers can look at a schematic and figure out what's going on, and improve any idea that they want to.

You are complaining that posters here do not treat you like a beginner that needs everything explained. Guilty. There is a Basics group for beginners.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

That's NT - and out of his own mouth.

--
Bill Sloman, Sydney

There's an element of explaining why they work, which John Larkin discounts, because he isn't very good at it.

Explaining why particular circuits don't work - or don't work very well - is another aspect of the group's activities. There John Larkin plays an even less prominent role.

--
Bill Sloman, Sydney

work.

And have it pirated by John Larkin?

He does a lot of that, and imagines that nobody notices.

complete with schematics, photos and justifications for each component cho ice and topology used. So I am not gonna be the one to break with that grat e tradition.

The fact that John Larkin isn't great at detailed justification may have mo re to do with his recitence in that area.

Nobody is going to treat Phil Allison as a beginner. He's not complaining a bout not having his hand held, but rather the absence of proper documentati on.

He may be asking a bit much. Proper documentation is bulky.

Sloman A.W., Buggs P., Molloy J., and Stewart D. ?A microcontroller

-based driver to stabilise the temperature of an optical stage to 1mK in th e range 4C to 38C, using a Peltier heat pump and a thermistor sensor? ? Measurement Science and Technology, 7 1653-64 (1996)

was ten pages long, but still includes apologies for incomplete documentati on of the circuits involved. It now has 24 citation - only two of them mine - so it was probably detailed enough to be useful.

--
Bill Sloman, Sydney

-------------------

** Happens here daily by Win, John and Phil H.

The Three Stooges.

** Not complaining about anything like that. Just the ingenuous nature of JLs malicious trap request. ** Have you *never* seen a published project in a magazine or on line ?

Ones I did for EA magazine consisted of 2 to 3 thousand words, colour pics, a PCB pattern and component layout, specifications list, block diagrams an d of course a full schematic with parts list and where to get any oddball p arts.

A prototype had to be supplied too, so the mag's staff could see that it wo rked and take their own pics.

Enough info was needed for a hobbyist and others to build one and for parts dealers to make up kits. The cost of such had to be less than any similar commercial offering - a major hurdle.

One was forbidden to use exotic, hard to get parts or expect builders to ow n more than a DMM.

The article had to interesting reading in it own right, to help sell the ma gazine when sitting on seller stands.

I seriously doubt any the Three Stooges would have a clue how to do the sam e.

.... Phil

.... Phil

.... Phil

er-based driver to stabilise the temperature of an optical stage to 1mK in the range 4C to 38C, using a Peltier heat pump and a thermistor sensor? ?? Measurement Science and Technology, 7 1653-64 (1996)

tion of the circuits involved. It now has 24 citation - only two of them mi ne - so it was probably detailed enough to be useful.

I was replying to your statement "Unless a part is very expensive, may as well test it to destruction."

Be careful doing that with electrolytics.

How does self-equalization work, and why does the I-V curve have to be exponential?

-------------------

** Ooops - should be "disingenuous" .

either describes you well enough

I have several such projects in my portfolio, but all in Polish (because the magazine is Polish). One of them is the magnetic amplifier-controlled synchronous rectifier. I posted pics and schematics here. I can send you the PDFs if you wish.

This is too stringent a requirement, given the prices of the Rigol scopes. It would be hard to debug my circuit with a DMM, too many windings with important polarities.

Best regards, Piotr

A 50V fed with 250V? What are the exact reasons behind going *that* far? Curiosity where the limit is is one thing, but I suppose there was something more. Are you abusing them in production for some reason?

Best regards, Piotr

------------------------------

** So not published by any leading national magazine. ** Wot is this Nutter on ??

..... Phil

Let's just be thankful he doesn't have access to any laboratory rodents. :-D

--
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The caps can easily have Q in excess of 1000. I have made inductors with Q that high, with litz wire, etc., but most are much lower. But even Q=100 can potentially turn 35 volts into over 3.5 kV. However, high Zout of the amplifier is a severe Q limitation. After solving that, you have to deal with high resonate circulating currents, and power dissipation in the inductors. If your capacitor goes first, that can save the inductor.

This scheme is most useful when driving piezo elements, where power injected into the coupled medium limits the Q and maximum voltage. E.g., my acoustic oceangraphic instruments in the 80s, and sonoluminescence experiments in the 90s, looking for the supposed neutrons, hahaha.

--
 Thanks, 
    - Win

That's a good find. Rather large: 20x42x40mm high.

--
 Thanks, 
    - Win

That was a corny attempt at humor whan I was a kid. Maybe it has recently propagated to Australia.

They are ideas, which is what electronoc designers start with when they are brainstorming. Fragments can be evolved or rejected or trigger other, sometimes very different ideas.

Brainstorming is a group of people having fun with ideas. You couldn't do it. You are angry and hostile and want everything to be a Heathkit manual. Some people poison brainstorming, and poison all stages of electronic design.

I just manufacture them and sell them. I do post some ideas and schematics and pictures of actual products here, when I think it would be helpful and not harm my business.

Must have missed them. Please repost the links.

Good grief, that's an interesting statement. Do you ever run Spice?

Again, buy a kit if you want to build something without having to understand it.

I think they are.

It's not my schematic style, but it's original, correct, and it works.

I prefet to waste more paper, spread things across less-populated sheets. Thet leaves more room for scribbles on the bench.

Possibly you re-discovered something. That happens a lot.

Not a bit, but your shrieking and swearing does sometimes put people off. Why do you do that? It can't make you any happier.

My stuff works and people buy it, and keep buying it. Do you contend that I don't understand it? That's silly.

(Well, OK, sometimes I don't understand it. I'm just an engineer.)

Some, or a lot, of what I do is instinct. Sorry. The solution space for even a modest electronic design is way too large to be searched by any canned procedure. It requires most of a brain to be working as a quantum computer, encompassing a lot of possibilities in parallel. That concept annoys a lot of people who want everything to be just so. Sorry.

"Theory of thought" is exactly what I don't want.

I can see the problem here. You want every circuit concept to be explained in detail, with values, like in some old HP manual.

Sorry.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Well, play the circuit design game with us. It's fun.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics

Win and Phil both author books (everybody should have both) and do proprietary designs that they can't publish. Which means that they work about 4x as hard as I do.

I design circuits on paper (literally on D-size vellum) and people do the schematic entry and PCB layout for me. Other people program uPs and FPGAs per my requirements. Other people code Python test software. Other people sell the stuff.

What I publish is the documentation that manufacturing needs to build and test and calibrate many products long-term. That's very different from a magazine article. [1]

Do you have Win's and Phil's books? Everyone here should read them cover to cover, as much for little details here and there as for the grand themes.

[1] I have never seen a book about how engineers should create documentation for manufacturing and test. All the companies that I've worked for or with seem to have their own standards, if they have standards.

--

John Larkin         Highland Technology, Inc 

lunatic fringe electronics