Have just checked I dont see any PORN site, the problem may be at your end.
However I do get an extraneous nonporn  popup window
Will try to locate reliable links to the actual pdf files for these
circuits.

Failing that I've actually downloaded them and can send them to anyone
who wants them.

Bruce

He has "ultra high performance rectifier bridges".  Sounds like snake oil to me.

Matt

On Dec 13, 2007 5:57 PM, Bruce Griffiths bruce.griffiths@xtra.co.nz wrote:

Matt Ettus wrote:

Try looking at the circuit  before commenting.
Different culture express themselves in slightly different ways, its
best to study the actual circuit and think about what the designer may
mean by the term.
You will find that he actually uses fast recovery diodes with snubbers
to reduce RFI.
You also have to bear in mind the market into which he is selling these
devices, they expect some hype of this sort.

Bruce

On Dec 13, 2007 6:15 PM, Bruce Griffiths bruce.griffiths@xtra.co.nz wrote:

I did.

Can you explain to me the use of fast recovery diodes if you are going
to put capacitors across them?

The market he is selling into expects snake oil.

Matt

On Fri, 14 Dec 2007, Bruce Griffiths wrote:

The problem is definitely not in my Sun workstation which is fortunately running
unix so it is impervious to all the bad people out there. But I have noticed
that sites target the locale of the IP address that is trying to access the URL.

Then depending on the laws of that country and also the whims of the site
owner, one will get very different things. So from New Zealand you are seeing
one thing and from Calif I am seeing another. It is referred to as targeted ads.

I saw that previously in another European site used by amateur radio operators.

Jeffrey

Spam detection software, running on the system "jeffrey150.pawlan.com", has
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Content preview:  On Fri, 14 Dec 2007, Bruce Griffiths wrote: > Have just checked
I dont see any P... site, the problem may be at your end. > However I do
get an extraneous nonporn popup window > Will try to locate reliable links
to the actual pdf files for these > circuits. > > Failing that I've actually
downloaded them and can send them to anyone > who wants them. > > Bruce [...]

Content analysis details:  (13.6 points, 5.0 required)

pts rule name              description

-1.4 ALL_TRUSTED            Passed through trusted hosts only via SMTP
15 JP_PORN                BODY: BODY: porn

Matt
Matt Ettus wrote:

Even with the snubber networks the reverse conduction time of the fast
recovery diodes is considerably shorter than when a standard recovery
rectifier is used.
Its the high current pulse during rectifier reverse recovery time that
generates the RFI when standard recovery rectifiers are used.
The transformer leakage inductance also exacerbates the situation
especially if a shunt capacitor and/or snubber isnt placed across the
rectifier AC input close to the rectifier.
As long as the reverse recovery isnt too abrupt fast recovery diodes
generate less RFI (at least at low RF frequencies) than standard
recovery rectifiers even when the input frequency is relatively low
(50Hz, 60Hz etc).

The effect of the additional capacitors and snubbers (particularly the
one across the rectifier AC input) is noticeable even when using
standard recovery diodes.
You can detect the RFI generated by unsnubbed rectifiers with an AM
radio at surprisingly large distances, when properly snubbed you have to
get much closer.

Thats why you have to make allowances.

Bruce

We even use snubbers across Shottky and FRED rectifiers, in spite of what
the vendor's litterature claims.
Anything that is non linear in series with a magnetic structure (does not
have to be a transformer, a trace or wire long enough would do) is a
potential source of ringing and noise.

Didier KO4BB

I can see using fast-recovery diodes if you want to rectify the output of a
switching supply, to limit the losses.  Ordinary 1N400x diodes start to run
very hot above a few kHz.  In a switcher, it would be reasonable to use
fast-recovery diodes with capacitors to control both EMI and loss.

But yeah, it's hard to see the point in a 50/60-Hz supply.  Schottkys have
less forward voltage drop, I guess, so maybe the idea is to use smaller
diodes/heat sinks for a given supply current.

-- john, KE5FX

On Thursday 13 December 2007 09:40:39 pm Jeffrey Pawlan wrote:

For stuff like this, it matters less what operating system you use than what
web browser you use -- and they all have had vulnerabilities so make sure you
keep it updated.

You can also be attacked via the DNS server you use -- in which case your
operating system is completely irrelevant.

Don't know about this specific case, but it often has nothing to do with
the "whims of the site owner". If they sell advertising space through a third
party, they are at least partly at the mercy of who the third party resells
the ad space to. Even sites that sell through Google Ads get nailed with bad
stuff once in a while because people manage to sneak stuff past them.

• Bob