Stupid polarized capacitor tricks

[Eeyore]

Write a '0' by reverse biasing the cap for a while to erode away the
oxide.

A while is likely to be days.

Readout is by measuring capacitance.

Measuring leakage current would be more sensible.

Graham

 

[Guy Macon]

I often use pre drilled etched uni-boards for testing small basic
circuits.

I remember when a breadboard was literally that, a wooden board
normally used to roll out bread, with the circuit being tested
laid out on it point-to-point.

I have used the white boards, and still have a couple around
for limited situations where the deficiencies don't matter.
For many years I would prototype with wire wrap (slit-N-wrap
is very good if you follow the instructions, unreliable if
you don't), but nowdays I do a simulation, lay out a board
with CAD, and send out for a fast-turnaround small-quantity
run of PWB's. The old methods just aren't practical in
todays's engineering environment.

Lately I have been working with 200A+ designs, which calls
for a completely different style of prototyping...

 

[Michael A. Terrell]

I remember when a breadboard was literally that, a wooden board
normally used to roll out bread, with the circuit being tested
laid out on it point-to-point.

I have used the white boards, and still have a couple around
for limited situations where the deficiencies don't matter.
For many years I would prototype with wire wrap (slit-N-wrap
is very good if you follow the instructions, unreliable if
you don't), but nowdays I do a simulation, lay out a board
with CAD, and send out for a fast-turnaround small-quantity
run of PWB's. The old methods just aren't practical in
todays's engineering environment.

Lately I have been working with 200A+ designs, which calls
for a completely different style of prototyping...

You better be careful at that power level, or you might be 'Macon
Bacon'. ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Guy Macon]

You better be careful at that power level, or you
might be 'Macon Bacon'. ;-)

<grin>

I have a nice thick polycarbonate sheet that I put
between myself and the power transistors...

Would you believe that not a single person in Junior
High School ever thought of calling me that? No?

 

[Michael A. Terrell]

<grin>

Ooh, that smells soooo good. Oh, wait, I'm on fire!
AHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!! ;-)

I have a nice thick polycarbonate sheet that I put
between myself and the power transistors...

Would you believe that not a single person in Junior
High School ever thought of calling me that? No?

I imagne they had a long list, like they did for everyone else. The
idiots at my school thought it was funny to stomp the crap out of my
foot, becasue of my initals. That was, till I beat the crap out of one
of them.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[John Fields]

A while is likely to be days.

 

[John Fields]

If it means so much to you , you can do it yourself.

---
The experiment itself means little to me since it's a trivial
exercise in construction and data acquisition, but what I find
interesting is that you're the one making claims that the outcome of
the experiment would be predictable and obvious, so it behooves you
to make the prediction and then prove it with the experiment. But,
of course, you refuse.
---

I personally don't feel the need to
perform an experiment, the outcome of which is predictable and obvious.
---
See?
---

Of course you *know* I'm right. If you thought I wasn't you would perform the experiment to
prove me wrong. Since you're not doing that, it's clear you're just mouthing off for the
sake of it.

---
Not at all. From your past performances, I automatically assume
you're wrong unless you somehow, miraculously, manage to get
yourself back into the frying pan.

If you're the one making the claim and _anyone_ refutes it, then
the onus of proof is on you.

Matter of fact, if you were trying to be honest instead of just
being gratuitously confrontational, you would have presented your
proof with your claim instead of trying to bullshit your way out of
trouble by making a lot of noise.

But, then, that's just you and you're not much of a scientist, are
you?

 

[John Fields]

Let me see.

11.6 days IS a bit more than one week. It's also less than 2 weeks. Problem ?

---
Not for me, but a _big_ problem for you, you phony bastard.

A bit more than a week might be, max, up to 1 day more than a week,
since that's the addition of the smallest integer unit of which
weeks are made.

4.6 days added on to a 7 day week is hardly a "bit longer than a
week", you disingenuous putz, it's way over a week and a half.

But maybe that's how they do it where you live?

Your nominal tax rate is, say, 30%, and a bit more than that is 46%?

 

[John Fields]

Likewise. I'm way too familiar with the 'right answer' to need to have to examine
something in detail that he's only bringing up as a stupid troll.

---
If, as you stated later, you aren't really concerned with what's
happening in the circuit because you never have to deal with mains
power over a few watts, then I suspect your "'right answer'" leaves
a lot to be desired in terms of loss of slop.
---

---
So you've found a niche where you think waste can be forgiven
because of stupidity? Sounds to me like Darwin's got you and yours
in his sights.
---

Why do you say (winding) resistance doesn't enter into it ? It's very significant with
typical line frequency transfomers !

---
Typical?

Maybe, if you're dealing with the kinds of mains transformers you're
used to, (<3VA) but as the transformer gets bigger the regulation
generally gets better.
---

In detail, I have absolutely no doubt.

---
In detail, you have absolutely no clue.
---

Some ppl love to 'show off' with their calculations.

---
And why shouldn't they? Heroes deserve recognition.

Would you chastise Newton for the mathematical exposition of his
discoveries in his Principia?

Probably, since you're a primitive know-nothing detractor who's only
interested in his own agenda.
---

I don't see the point where the answer's so obvious.

 

[John Larkin]

---
Depends on the area of the "bit", dumb ass, the composition of the
electrolyte, and the reverse current.

Do the math...

Since electrolytic rectifiers work fine at 60 Hz, it seems that one
can oxidize or strip an AlO2 layer in milliseconds.

John

 

[John Fields]

Since electrolytic rectifiers work fine at 60 Hz, it seems that one
can oxidize or strip an AlO2 layer in milliseconds.

 

[Jamie]

That's was made just before the flux capacitor

 

[John Larkin]

Yup. See my post of 9/26, a couple of inches down in this thread.

John

 

[The Phantom]

---
If you understood it perfectly and it's at odds with reality, which
you also seem to think you understand perfectly, then it should be a
trivial matter for you to spot and report where I went wrong.

I don't see that happening any time soon, even though I think there
was a small error in my work which I'm still examining.

I'd tell you what it was, but that would be cheating.

John,

I missed this analysis; where did you post it? In this group? Can you
give me a Google link to it?

 

[Eeyore]

What 'bit area' ?

dumb ass, the composition of the electrolyte, and the reverse current.

Do the math...

Why don't you do the experiment since you're so interested ?

Graham

 

[The Phantom]

I didnt study his analysis in any detail - because I really dont care; I
seldom if ever use mains transformers, and never for any power level
above a few watts, making anything but the crudest analyses unnecessary

when operating a cap/bridge from mains, resistance doesnt really enter
into it, but inductance sure does.

Barton has a seriously detailed exposition of the humble
rectifier-capacitor filter (one chapter worth), if you do it properly
its surprisingly complex.

Would you post the full name of the book and its author?

 

[Eeyore]

Since electrolytic rectifiers work fine at 60 Hz, it seems that one
can oxidize or strip an AlO2 layer in milliseconds.

Depends on the thickness of the layer and the applied current.

Graham

 

[Michael A. Terrell]

http://www.pmillett.com/technical_books_online.htm has a lot of old
electronics books to download for free.
http://www.pmillett.com/Books/RDH3.pdf
http://www.pmillett.com/Books/intro_RDH4.pdf are the third and forth
editions of the Radiotron Designer's Handbook


http://www.pmillett.com/Books/audels.pdf is the Audels Radiomans Guide
from 1945. These old books cover some very obsolete electrical and
electronic technology.

http://www.gutenberg.org/newsletter/archive/PGWeekly_2003_02_19.txt is a
ham radio book from 1922.-


<http://books.google.com/books?id=X1...ts=MpVqsImzvt&sig=suObtjwDeWcyc5MSrrUt84cspp4>
has several references to electrolytic rectifiers.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Michael A. Terrell]

That's was made just before the flux capacitor -

No, you idiot. They were made, and used 100 years ago.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[John Fields]

John,

I missed this analysis; where did you post it? In this group? Can you
give me a Google link to it?