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--- In Electronics_101@..., Stefan Trethan
<stefan_trethan@g...> wrote:

That's exactly the point.
nobody (ok maybe only i) want's a forum like all the other web

forums.

yahoo is so convenient to use, in a forum you never read that much

of the

threads,
and you do not answer that often. usenet is also unconvenient, but

i think

this is more due to the users and rules than the system itself.

The concept of the maillist is ideal in my opinion, it is easy to

use and

you have local archive storage included..

I agree. I prefer not to get mail and would rather just read on the
yahoo website (which is why the search neutering is such a problem
for me).

Any replacement would have to include both web-interface and mailing
list capabilities. A search option is a must, the more robust the
better. File area is a must as well of course ;)

I also agree usenet is a bad choice, too many auto-spammers.

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Actually, you beat me to the punch of suggesting a web-forum solution such
as VBulletin, which I thought of (typically) AFTER hitting the <send>
button. I belong to two of those, although NOT in any sort of
administrative capacity. But both you and ST have good points: webforums
are everywhere, and NNTP--Usenet--has been around for thousands of years.
Hundreds, anyway. And it's as simple as a text file. Why reinvent the
wheel? Because we've all forgotten how to drive a stick? (Forgive the bad
analogy!)

If I may be so bold as to be, well, bold <ahem>, perhaps we have all (myself
generously included) grown too accustomed to being patronized by entities
such as Yahoo. We have an interest in keeping things simple, with an
"automatic transmission," and they have an interest in keeping us captive
audience to their ads. How convenient. Riiiight.

Maybe it's time to think differently. Do any of you guys remember the
original eGroups, just a few years ago, when things really seemed to run
well? For that matter, (to strain an already overtaxed analogy) did any of
us ever used to tune up our own cars?

On one hand, I'm starting to scare myself at how radical I'm sounding. But
on the other hand...

<Channelling Braveheart:--"FREEEEEEDOOOOOMMMMM!!!!">

Oops. I seem to have misplaced my blue facepaint.

If anything I have said is flameworthy, flame away.

-DM

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Would a series of ANDs do the job?

That's exactly the point.
nobody (ok maybe only i) want's a forum like all the other web forums.
yahoo is so convenient to use, in a forum you never read that much of the threads,
and you do not answer that often. usenet is also unconvenient, but i think
this is more due to the users and rules than the system itself.

The concept of the maillist is ideal in my opinion, it is easy to use and
you have local archive storage included..
I do prefer the yahoo mailgroup over any other form of forum.

I think there would be software available to make a maillist that
can be used exactly like the yahoo mailgroups, but i see no need if yahoo
recovers and will work normally again.....

But if it continues to be that bad (last 2 days or so) i would
appreciate a other forum very much.
It is true there are built-in answering delays because of different
time-zones etc. but this is not the problem. the problem is that the messages
do not appear within several minutes or so. There are answers written to questions
that are already answered long ago, unneccesary double answers etc.
For me personally the last days were very unconvenient, i don't know
by now if it is only yahoo or also my mailprovider going crazy but i have
definitely lost some posts that appear on the web interface.
I do think it would be a heavy blow to all the lists if the quality continues
to be that bad.

I suggest we wait and see what happens, next week it may be ok again.
But i would say the "alternatives talk" is not off topic.

If some of the experts want to check the possibilites i suggest go and look
for mailgroup solutions, it is what all the members seem to like.

Let's hope it gets better soon..

ST

--- In Electronics_101@..., "Phil" <phil1960us@y...>
wrote:

--- In Electronics_101@..., "ghidera2000"
<ghidera2000@y...> wrote:
...

You know, between the neutering of the search function and the
(relatively) frequent board problems, I'm thinking its time to

start

searching for a new message board home.

The loss of the search was a BIG hit - I used it all the time in
several groups.

I am with you on that one. I would love it if there was a similar
site with a decent search and would be there in a flash.

I'm a web developer, I do a lot of php programming and stuff. would
anyone like to team up with me to start a forum site? I host and help
out with the schematicaforfree site, so we could affiliate with them.
they get about 1000 unique visitors each day. we could either use a
forum like phpbb, or vbulletin or something, or I could write one for
the site.

Matt

I have used a few different lists and I really reallly reallly like
the flat sheet format of the yahoo list. and, I really really
really dislike the seperate threads of other lists.


Yahoo is going to have to mess up a lot before I'll switch.


Also, I have yet to have a problem, post it to the list and get a
direct answer back within seconds. sometimes it takes hours before
somone in some part of the world sees my post and answers. I don't
care if yahoo delays my post for an hour.

Dave





--- In Electronics_101@..., Stefan Trethan
<stefan_trethan@g...> wrote:

If you want my 2 cent:

Get a decent webspace, for archives and file storage,
and switch the list to usenet news.
but then, there are several lists like this available as usenet
newsgroups....

Let's see if yahoo doesn't sort out those things in the next few

days

before considering any big steps...

to the search problem: get a decent mail software and you can at

least

search in the messages since you joined.


ST



On Fri, 9 Apr 2004 12:40:36 -0400, dangermouse

<dangermouse1956@g...>

wrote:

If anyone is interested in the work and expense involved in

hosting it

ourselves, we can do what Ian Purdie (of
)
has done, and host our own mailing list with the free, GNU-

licensed

Mailman
software ( ).

No, I'm no expert on its use, nor have I ever been a webmaster

before,

but I
do have a brain in my skull (at least according to the doctor who
delivered
me), and generally speaking there are at least a few moderately
intelligent
folks on this list (moderators excepted, of course ;o) ) and

between us

all
we should be able to figure out how to use it.

Then all we would have to worry about would be paying for server

space

somewhere, and good server space is pretty cheap if spread

around

amongst
1800 of us. $35 or $40 per month would translate to only two

cents per

member per month. Even if only ten percent of our current members
subscribed to the new site, that would be pennies per month. Not

too

shabby, and we could build a REAL website, not like the silly

little

thing
we get with those yahoos...um, sorry. You know what I mean.

Am I being silly, or is this a workable idea?

If you want my 2 cent:

Get a decent webspace, for archives and file storage,
and switch the list to usenet news.
but then, there are several lists like this available as usenet newsgroups....

Let's see if yahoo doesn't sort out those things in the next few days
before considering any big steps...

to the search problem: get a decent mail software and you can at least
search in the messages since you joined.


ST

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>I was thinking of putting a precision rectifier in the sensor box,
>adding gain in the monitor box then splitting the signal into two.
>Once would go straight to the ADC for measuring the highest spikes
>while the other would go to a capacitor for electrical averaging of
>the peaks. That way I can do the fast sampling for spikes without
>the overhead of peak value discovery and averaging (20 samples per
>wave thing) and just a single sample to find the average peak.

This sounds very reasonable to me.? My color organ was built on a

precision rectifier followed by six RC integrators.? These were fed

into a quad comparator.? Let me know if you need schematics for a

precision rectifier.

?

>Probably use an OPA2340 to split the (rectified) signal into two and
>add gain, then experiment from there.

Yes, I was just going to suggest a buffer before the averaging circuit.

>Oh and, I did some experimenting with PWM signals through a long
>cable. Without a resistor added, the signal was distorted. I added a
>1K resistor and the signal came out a lot cleaner. Think I'm getting
>a grasp of this cable capacitance problem. Its not so much added
>noise from the enviroment as it is the cable capacitance distorting
>the signal thats already there. Square waves turn into rounded
>corner waves and the amplitude bounces around. Less current means
>less capacitance effect, cleaner signal.

?

The resistor and the capacitance of the cable will form a low-pass filter.

This one's got me perplexed because your S/N ratio will be less.? Not sure

what you mean by amplitude bouncing around.? I would suspect that your

driver circuit is not capable of driving highly capacative loads.? It may

not be putting out enough current or has a lot of ringing, etc.? Place

a 50 ohm resistor between the output of the driver in the feedback loop and

see if it drives the capacitance with more stability.

This is interesting to me, so please keep me informed.

?

Good luck,

Actually, I was contemplating paying for a host myself. I was just
about to start looking for hosts that allow mailing lists and file
areas 8)

$35-$40 a month isn't a big deal to me compared to the huge amount of
help I get on this list.

If anyone knows a good *RELIABLE* website hosting company, I'd love
to get a link.

--- In Electronics_101@..., "dangermouse"
<dangermouse1956@g...> wrote:

If anyone is interested in the work and expense involved in hosting

it

ourselves, we can do what Ian Purdie (of

tutorials.com/ )

has done, and host our own mailing list with the free, GNU-licensed

Mailman

software ( ).

No, I'm no expert on its use, nor have I ever been a webmaster

before, but I

do have a brain in my skull (at least according to the doctor who

delivered

me), and generally speaking there are at least a few moderately

intelligent

folks on this list (moderators excepted, of course ;o) ) and

between us all

we should be able to figure out how to use it.

Then all we would have to worry about would be paying for server

space

somewhere, and good server space is pretty cheap if spread around

amongst

1800 of us. $35 or $40 per month would translate to only two cents

per

member per month. Even if only ten percent of our current members
subscribed to the new site, that would be pennies per month. Not

too

shabby, and we could build a REAL website, not like the silly

little thing

we get with those yahoos...um, sorry. You know what I mean.

Am I being silly, or is this a workable idea?

-DM

If anyone is interested in the work and expense involved in hosting it
ourselves, we can do what Ian Purdie (of )
has done, and host our own mailing list with the free, GNU-licensed Mailman
software ( ).

No, I'm no expert on its use, nor have I ever been a webmaster before, but I
do have a brain in my skull (at least according to the doctor who delivered
me), and generally speaking there are at least a few moderately intelligent
folks on this list (moderators excepted, of course ;o) ) and between us all
we should be able to figure out how to use it.

Then all we would have to worry about would be paying for server space
somewhere, and good server space is pretty cheap if spread around amongst
1800 of us. $35 or $40 per month would translate to only two cents per
member per month. Even if only ten percent of our current members
subscribed to the new site, that would be pennies per month. Not too
shabby, and we could build a REAL website, not like the silly little thing
we get with those yahoos...um, sorry. You know what I mean.

Am I being silly, or is this a workable idea?

-DM

--- In Electronics_101@..., "ghidera2000"
<ghidera2000@y...> wrote:
...

You know, between the neutering of the search function and the
(relatively) frequent board problems, I'm thinking its time to

start

searching for a new message board home.

The loss of the search was a BIG hit - I used it all the time in
several groups.

I am with you on that one. I would love it if there was a similar
site with a decent search and would be there in a flash.

--- In Electronics_101@..., "Phil" <phil1960us@y...>
wrote:

Posts are getting randomly delayed. If you post something and it
doesn't show up within a few minutes, please give it a while

longer

(couple of hours). Its getting confusing seeing multiple variants

of

the same posting.

Yes, my 6AM posting yesterday morning didn't show up until after
4PM... I learned to be patient a long time ago though, thats why you
dont see multiple posts ;)

You know, between the neutering of the search function and the
(relatively) frequent board problems, I'm thinking its time to start
searching for a new message board home.

The loss of the search was a BIG hit - I used it all the time in
several groups.

Hi All,
I am trying to search for a better way to design a programmable analog
filter. I implemented a 2nd order Sallen&key filter with DC adjust a while
back using AD8400 digital potentiometers.
I am looking for ideas to use a FET as a variable resistor.

I am uploading the existing design "Filter with DC adjust.jpg" in group
files.

Any suggestions or ideas..............


Regards,

Syed Rizvi

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the Electronics_101
group.

File : /Filter with DC adjust.jpg
Uploaded by : shrizvi1974 <engrHasanRizvi@...>
Description : Filter with DC adjust

You can access this file at the URL



To learn more about file sharing for your group, please visit



Regards,

shrizvi1974 <engrHasanRizvi@...>

Steve,

I took apart (sawed and pryed etc) the flyback just to see how is is
constucted.

I purchased another old $2 monitor. I removed the CRT and made a
Jacobs Ladder. The idea came from this website


My next step will be to remove the flyback from this old Radioshack
color montior. It has what I think is a seperate Hv rectifier -
square cube about 1"x1"x1" that is located after the flyback and
before the ctr.

Bob




--- In Electronics_101@..., "Steve" <alienrelics@y...>
wrote:

--- In Electronics_101@..., "rsnyder187"

<rsnyder187@y...>

wrote:

Alien Steve

The flyback has a ferrite core going down the middle of the

windings

and extending outside to form a large 0. This large 0 is made

with a

split which is held together by a large U shaped spring clamp. Is

the

external portion where to wrap these new primary windings around?

Yes.

The crack (from falling form the workbench) is the ferrite and is

all

the way through. The large U clamp keeps it still in one piece.

Do

do think it would be ruined?

Probably fine for your purpose. I would not put it back in a TV or
monitor and expect it to work, but for experimenting with high

voltage

you won't be running it at anywhere near its full power so it will
probably be OK.

Alien Steve

Look at the fig. 8 of this datasheet:

The Vfr means the maximum voltage peak that's produced when the diode is switched on, due to the accumulated loads (I think so; corrections are welcome)

---

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