sci.electronics.design Google Group

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Re: Power factor correction

(Fred Bartoli) — Mon, 04 Jan 2010 09:30:11 UT

Paul Keinanen a écrit :
For Tim, which I suspect is asking this for his induction heater, it
might be easier to use his bridge so as to draw sine current.
The output power will be sine squared but who cares? And that'll put
more requirement on some components for the same average output power,
but it'll avoid a full PFC stage which won't do good on efficiency, and

Re: How do you design these days?

j...@devereux.me.uk (John Devereux) — Mon, 04 Jan 2010 08:57:19 UT

[...]
That does change the equation. We have a couple of 4 layer boards, but
mostly I try to keep to two layers. The one I just did uses a fairly
bloated "single-chip" microcontroller, with external SDRAM and a TFT LCD
interface. I have managed to maintain a fairly good groundplane on one
side but this is the most that I would attempt on two-layer.

Re: Cleaning boards

onebigle...@infiniteseries.org (Archimedes' Lever) — Mon, 04 Jan 2010 08:51:22 UT

On Mon, 04 Jan 2010 03:43:09 -0500, Spehro Pefhany
An alcohol wash NEVER compromises anything when used to clean a pcb.
One can even use it on old, crystallized flux, if you first heat up
both the assembly, and the alcohol. When you apply the heat to the
assembly, you may see it re-liquify, making it even easier to remove.

Re: Cleaning boards

que...@kbd.com (Nik Rim) — Mon, 04 Jan 2010 08:50:44 UT

Yeah that'd be about what our (kitchen) oven does on lowest setting, just
hot enough that you can't hold it for too long!

Re: Cleaning boards

onebigle...@infiniteseries.org (Archimedes' Lever) — Mon, 04 Jan 2010 08:44:10 UT

Any PCB assembly can handle like 80C. for long term baking operations.
That is like 176F.

Re: Convolution Tutorial

inva...@invalid.invalid (invalid) — Mon, 04 Jan 2010 08:38:35 UT

The mental processes that you followed in generating your
answer above were subconscious. Your thinking mechanisms
are innate from when you were born, and not something
trained into you.

Re: Cleaning boards

speffs...@interlogdotyou.knowwhat (Spehro Pefhany) — Mon, 04 Jan 2010 08:43:09 UT

On Mon, 04 Jan 2010 00:23:49 -0800, the renowned Archimedes' Lever
It works better, IME, and dries faster. As with an uncontrolled
soldering iron, one must work skillfully to avoid compromising
quality.

Best regards,
Spehro Pefhany

Re: Convolution Tutorial

inva...@invalid.invalid (invalid) — Mon, 04 Jan 2010 08:35:39 UT

Or to discover every mathematical principle of import to
engineering today.
Which is why bad textbooks, and bad websites, should be
severely panned, especially those which start off describing convolution
as an arcane never-to-be-fathomed mathematical process when
in fact it is a straightforward derivation from the response of systems.

Re: Cleaning boards

onebigle...@infiniteseries.org (Archimedes' Lever) — Mon, 04 Jan 2010 08:23:49 UT

On Mon, 04 Jan 2010 02:13:24 -0500, Spehro Pefhany
Rosin fluxes use an alcohol vehicle. Why would you use paint thinner on
that? Not only that, but it attacks other elements of the assembly
besides just the flux.

ICMIT2010 submission site closes on 7 Jan.

icmit2...@gmail.com (ICMIT2006) — Mon, 04 Jan 2010 08:22:44 UT

Dear collegues and friends,
Because of the year end holidays in many countries, the ICMIT
submission portal will remain open until 7 Jan midnight (Pacific
Standard Time) for those just return to work. You may still make
changes or to submit additional papers before that. Note that all
submissions will have to be done online, not by e-mail. Thank you.

Re: "Scientific" American

|||newspam...@nezumi.demon.co.uk (Martin Brown) — Mon, 04 Jan 2010 08:08:12 UT

AmSci was about how to do things and all the practical details.
You do *NOT* learn how to dissect on living animals unless you are a
deranged sadist. The articles were pulled for very good reason in the
UK. Cruelty to animals legislation outlaws it absolutely. The publishers
were worried about being had up for incitement to commit a crime.

Re: Cleaning boards

que...@kbd.com (Nik Rim) — Mon, 04 Jan 2010 08:02:33 UT

Cheap way I use with rosin flux solder is: methylated spirits (a soak for a
minute helps) then brush with tooth brush. Brush & rinse with distilled /
deionised water. Dry off in the sun or in the oven set to the coolest
setting.