Very fast rise time generator...

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[Klaus Kragelund]

On 14-02-2023 17:19, John Larkin wrote:

On Tue, 14 Feb 2023 07:16:41 -0800 (PST), Klaus Kragelund
klaus.kragelund@gmail.com> wrote:

Hi

I am working on a very fast rise time generator. I need to supply 30V or more into a capacitive load of 50pF in less than a nanosecond, sourcing about 2A during the transient. It\'s for a prototype test, so no real concerns of cost and availability.


I\'ve been thinking about fast high-voltage pulsers lately too.

So far I have been using a fast GaN gatedriver and a EPC2018. That performs well, about 600ps to 30V.

Is that a sim or a real circuit? All my EPC2018 sims have been
optimistic on speed.
It a real circuit. Even with non-optimal layout, we got 600ps to 30V.
What are you driving the gate with?
LMG1020. Pretty much the fastest gatedriver I can find

I would like to push it even further.

One idea I was thinking about was to use LVDS driver, or any other driver with below 100ps rise time. That can create a fast edge, but not to 30V. I could then trigger 10 of these circuits, and capacitive couple them in a rolling sequence (diodes in series to prevent back flow), each carefully triggered so they would build on each other.

Other concept is to use a HF transistor, but I don\'t think it would be faster than the GaN, all though I have no idea, never done real HF stuff before.

I was also thinking bringing a transistor into avalance, like a circuit done by Jim Thomson:

https://electronicprojectsforfun.files.wordpress.com/2017/10/jimwilliamsan47applicationnode.pdf

(Page 94)

He states below 300ps risetime. It\'s been 30 years, surely something exists that is faster?

ADCMP580 has 37ps risetime:

https://www.analog.com/media/en/technical-documentation/data-sheets/ADCMP580_581_582.pdf

A regular inverter switches around 1ns:

https://www.ti.com/lit/ds/symlink/sn74auc2g06.pdf?HQS=dis-dk-null-digikeymode-dsf-pf-null-wwe&ts=1676384474996&ref_url=https%253A%252F%252Fwww.ti.com%252Fgeneral%252Fdocs%252Fsuppproductinfo.tsp%253FdistId%253D10%2526gotoUrl%253Dhttps%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Fsn74auc2g06

Seems about 500ps is possible with ultra cheap inverter.

Here\'s a 6 USD 20ps switch:

http://ww1.microchip.com/downloads/en/DeviceDoc/sy58051u.pdf


There are lots of gates and comparators with edges below 40 ps,
including the GigaComm parts, but they have small swings and need to
be amplified. MC10EL/EP89 are pretty fast and swing more, but would
still need an amp.

One Tiny cmos flop has a rising edge below 100 ps.

https://www.dropbox.com/s/7gajbmt923oesli/NC7SV74_2.JPG?raw
That shot is actually 1v/div.
Very fast rising edge

How do you hook up the 11802 to do that measurement. A 1k resistor at the board into the coax cable and 50ohms termination?

I\'ve made a 1400 volt pulse with 3 ns risetime with a SiC fet.
Can you share how, which FET and gatedriver?

Anyone got other ideas?

The classic brutal driver is a step-recovery diode.

Or a contact closure.

Distributed amplifiers are interesting but difficult. They are usually
linear amps but there is no fundamental reason why they couldn\'t work
switchmode.

A radial, as opposed to inline, DA might be fun.

NLTLs, shock lines, are another way to get fast high voltage pulses.
McEwan did a lot of that.

Yes, seems Thomas McEwan had a lot of patents:

https://radaris.com/f/Thomas/Mcewan/Inventor>

 

[Rod Speed]

On Sat, 18 Feb 2023 05:00:03 +1100, Commander Kinsey <CK1@nospam.com>
wrote:

On Mon, 13 Feb 2023 23:30:34 -0000, John Larkin
jlarkin@highlandsnipmetechnology.com> wrote:

Here\'s a really good book about the history and decline of the British
empire.

We only declined because we got politically correct and gave back
countries we\'d quite rightfully stolen.

Nope, because WW1 and WW2 essentially bankrupted the country.

 

[Peeler]

On 22 Feb 2023 14:40:11 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:

At least in the US the default is to dial 911. The pizza was cold when the
guy delivered it? Dial 911.

Somewhat like: Got nobody in real life to listen to you? Suck troll cock on
Usenet, you abnormal senile bigmouth? <BG>

--
Yet more absolutely idiotic senile blather by lowbrowwoman:
\"I save my fries quota for one of the local food trucks that offers
poutine every now and then. If you\'re going for a coronary might as well
do it right.\"
MID: <ivdi4gF8btlU1@mid.individual.net>

 

[NY]

On 15/02/2023 11:27, Max Demian wrote:

(In Lancashire/Manchester shop girls call you \"luv\", which is a bit of a
degradation of meaning.)

It\'s fairly common throughout *all* the north of England: in Yorkshire
as well as Lancashire. When I moved back to near York about 15 years
ago, after living in the south since my teens, before which I lived in
Leeds, it came as a slight shock to be called \"luv\" by shopgirls (*),
but I quickly became used to it again.

(*) Never by male shop assistants, though they may use it to female
customers.


Where is it that the equivalent term, used by shop assistants etc, is
\"lover\"? That is probably stretching things a bit *too* far ;-)

Other regions use \"duck\" (Derbyshire/Leicestershire) or \"pet\" (Newcastle
area).

Then you\'ve got London terms - the one that immediately springs to mind
is Pete Beale (Peter Dean) in Eastenders, who called female customers on
his market stall \"Treacle\" - pronounced Tweekew, with W in place of the
R, maybe because he couldn\'t say R, and a W in place of the L as is
common in East London - miwk bock-ews (milk bottles) etc.

 

[micky]

In alt.home.repair, on Tue, 14 Feb 2023 22:46:35 +0000, Ian Jackson
<ianREMOVETHISjackson@g3ohx.co.uk> wrote:

In message <2betbjxebg.ln2@Telcontar.valinor>, Carlos E.R.
robin_listas@es.invalid> writes




For instance, the book I started learning English taught the expression
\"it is raining cats and dogs\". Most of the times I tried to use it,
nobody understood it and I had to explain :-D

English (well, British English) is absolutely saturated with such
expressions, and this must mystify and confuse the benighted foreigner.

Plates of meat, that\'s your feet.
Trouble and strife, that\'s your wife.
There are more I can\'t recall now.

Cockney rhyming slang? Used by everyone? Certain groups?

Did I learn about this in My Fair Lady?

IIRC, the theme of one of the early Startrek episodes was devoted to
understanding the inhabitants of a planet whose language consisted
almost entirely of metaphors and the like.

 

[Peeler]

On 20 Feb 2023 01:00:55 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> I grew up in the Tri-Cities area of NYS.

HIGHLY interesting info again. Just like everything you keep telling
everyone about your great personality, you self-admiring senile shithead!
LOL

--
Gossiping \"lowbrowwoman\" about herself:
\"Usenet is my blog... I don\'t give a damn if anyone ever reads my posts
but they are useful in marshaling [sic] my thoughts.\"
MID: <iteioiF60jmU1@mid.individual.net>

 

[Peeler]

On 22 Feb 2023 14:41:33 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> A room temperature IQ helps. All them numbers is just white supremacy.

Feeling better again, senile bullshit artist? <G>

--
More typical idiotic senile gossip by lowbrowwoman:
\"It\'s been years since I\'ve been in a fast food burger joint but I used
to like Wendy\'s because they had a salad bar and baked potatoes.\"
MID: <ivdi4gF8btlU1@mid.individual.net>

 

[Jan Panteltje]

On a sunny day (Wed, 15 Feb 2023 15:31:58 +0100) it happened Klaus Vestergaard
Kragelund <klauskvik@hotmail.com> wrote in <tsiqcv$2tidt$2@dont-email.me>:

On 14-02-2023 22:54, Uwe Bonnes wrote:
John Larkin <jlarkin@highlandsnipmetechnology.com> wrote:

The diodes Inc/Zetex avalanche transistors are still available.

Higher rates are hard to reach with avalache transistors. What frequency
does the original poster need?

I can do with below 1MHz, just need the very high risetime

Relais contact?

30V - big cap - relais - your cap

 

[Carlos E. R.]

On 2023-02-17 20:13, micky wrote:

In alt.home.repair, on Tue, 14 Feb 2023 20:10:59 +0100, \"Carlos E. R.\" <robin_listas@es.invalid> wrote:
On 2023-02-14 19:54, Rod Speed wrote:
On Wed, 15 Feb 2023 05:30:17 +1100, Carlos E. R. <robin_listas@es.invalid> wrote:
On 2023-02-14 19:18, Rod Speed wrote:
On Wed, 15 Feb 2023 01:17:43 +1100, Ian Jackson <ianREMOVETHISjackson@g3ohx.co.uk> wrote:
In message <op.10bquhfubyq249@pvr2.lan>, Rod Speed <rod.speed.aaa@gmail.com> writes
On Tue, 14 Feb 2023 08:00:14 +1100, NY <me@privacy.invalid> wrote:




Yes, I\'m not saying that Japanese grass and veg is blue, just they
(apparently) used the same word to describe both green and blue.

Sounds unlikely given that they must have noticed that the sky and
grass  arent the same color

Languages are strange things,
 Specially  the ones like english which have hijacked
useful words from any language of a country they
have fucked over or had anything to do with.

and some don\'t have words for the bleedin\' obvious.
 Can\'t think of any examples of that.

For example, Latin and in Gaelic seem to have difficulty with the
simple concept of \'Yes\' and \'No\'.
 Presumably because they prefer more subtle variations of those words.
 Same with languages which dont have a simple \'you\' and
have different words used for those you know well and
those you don\'t.

English uses \"you\" for both plural and singular.

Some use the word yous for the plural. I used to say \'you too\'
when asking the parents what they planned to do when together
and for some reason my stupid step mother didnt like that phrase.

\"Thou\" is not used.

I didn\'t mean that. I meant when two different words are
used in some languages like german for people who are
familiar to the speaker or not.

Like tu and usted in Spanish, or ??? and ustedes.

Maybe. \"Usted\" is formal, and probably derive from some plural form, but
I\'m not a linguist.

Once in 1971, I met a pretty girl on the street in Guatamala City, and
when I asked directions, she didn\'t seem to be in a hurry, and I wanted
to get to know her, but the conversation ended. Later I thought she
might have been put off because I kept addressing her as usted instead
of tu, which was by then the standard among people our age. But I had
learned Spanish starting only 5 months before, and usted was one of the
half-dozen words I knew before then.

It seems that the use of pronouns differs on each country and epoch.
I can only say that \"usted\" is not used much in Spain, contrary to the
americas usage.

The verb \"to be\" in Spanish is two different verbs with obviously
different meanings (to us Spanish), but English speakers confuse them
all the time.

How did you find english ?  It can be a bizarrely complicated language
for some like a mate of mine who while being turkish/kurdish, spent his
entire school time in australian schools. They did speak their own language
at home and his mother has almost no english at all. His dad isnt too
bad at all.

Initially, difficult. Then, easy. It is an easy grammar. Spelling is
just memory, I never learned any rules. I either know the word or not.
Pronunciation was more difficult: there are many vowel sounds that are
hard to get (we simply can not hear the difference: for example, \"oil\").
I can hardly guess right how to pronounce a new word.

Someone in the hotel I was staying at spent a full 5 minutes teaching me
how to say periodico in Spanish (I think I kept saying the I as a
vowel), and a guy on highway crew that picked us up hitchhiking spent 5
minutes or more how to say a V that is half-way betweeen a B and a V,
v-vaca vs b-burro.

Ah, v vs b... Not in Spain, both sound exactly the same.

I don\'t know if I got the translation right, I asked DeepL: in some
places, the \"b\" is bilabial and the \"v\" is fricative.

I can\'t remember what it is now but there was some word I learned to say
from cowboy movies (that is, any Western movie about the late 1800\'s)
and later I found out Mexicans pronounced it that way in rural areas,
but more simply in the city. So the cowboy movie set in the
countryside was right. I think it was a nasal \"sing song\" up-pitch at
the end of \"Si, senor\".

I wouldn\'t know that myself

Interesting.

I do almost all their govt forms because they don\'t know what words like
spouse mean.

LOL I think I never heard that word until I was 10 years old. There
was a group of words I\'d never heard until we moved to Indiana when I
was 10, reflect meaning to think, etc. The teacher Mrs. Tune used them
and to myself I called her Looney Tune becuase of her strange language.

--
Cheers,
Carlos E.R.

 

[Peeler]

On 20 Feb 2023 00:23:13 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> The density in the city is about 2300

You\'d better worry about the density inside your senile head, you
self-important self-admiring senile bigmouth!

--
More of the senile gossip\'s absolutely idiotic senile blather:
\"I stopped for breakfast at a diner in Virginia when the state didn\'t do
DST. I remarked on the time difference and the crusty old waitress said
\'We keep God\'s time in Virginia.\'

I also lived in Ft. Wayne for a while.\"

MID: <t0tjfa$6r5$1@dont-email.me>

BOISTEROUS BRAGGART

 

[Peeler]

On 22 Feb 2023 14:43:11 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> Never had a cat, did you?

You STILL have no one in RL who wants to listen to you and your endless
bullshit, senile sucker of troll cock?

--
Yet more of the so very interesting senile blather by lowbrowwoman:
\"My family loaded me into a \'51 Chevy and drove from NY to Seattle and
back in \'52. I\'m alive. The Chevy had a painted steel dashboard with two
little hand prints worn down to the primer because I liked to stand up
and lean on it to see where we were going.\"
MID: <j2kuc1F3ejsU1@mid.individual.net>

 

[Klaus Vestergaard Kragelund]

On 15-02-2023 16:09, Jan Panteltje wrote:

On a sunny day (Wed, 15 Feb 2023 15:31:58 +0100) it happened Klaus Vestergaard
Kragelund <klauskvik@hotmail.com> wrote in <tsiqcv$2tidt$2@dont-email.me>:

On 14-02-2023 22:54, Uwe Bonnes wrote:
John Larkin <jlarkin@highlandsnipmetechnology.com> wrote:

The diodes Inc/Zetex avalanche transistors are still available.

Higher rates are hard to reach with avalache transistors. What frequency
does the original poster need?

I can do with below 1MHz, just need the very high risetime

Relais contact?

30V - big cap - relais - your cap

It wont be that fast, from what I read wetted contacts can reach 10ns,
not in picoseconds

 

[Commander Kinsey]

On Wed, 15 Feb 2023 15:29:09 -0000, Carlos E. R. <robin_listas@es.invalid> wrote:

On 2023-02-15 15:51, Commander Kinsey wrote:
On Sun, 12 Feb 2023 13:50:48 -0000, Carlos E.R. <robin_listas@es.invalid> wrote:
On 2023-02-11 15:28, Joe wrote:
On Sat, 11 Feb 2023 13:53:05 -0000 \"Commander Kinsey\" <CK1@nospam.com> wrote:
On Sat, 11 Feb 2023 13:23:55 -0000, Joe <joe@jretrading.com> wrote:
On Sat, 11 Feb 2023 13:15:36 -0000 \"Commander Kinsey\" <CK1@nospam.com> wrote:

What I\'ve never understood is people indicating the wrong way. I
know someone who can\'t remember which is which - I pointed out you
move the stalk the same way you\'re going too turn then wheel, and
she thought that was some kind of brilliant idea. And I know
someone else who came up with some crazy reason it\'s best to tell
people you\'re going the other way as somehow lying puts you at an
advantage?

I once drove a BMW (not mine) and the indicators were very clever.
Push in the appropriate direction to turn them on, push the other
way to cancel (e.g. changing lanes where the wheel doesn\'t move
far). However, linger a fraction too long on the cancel, and it
starts indicating the other way...

Sounds stupid. Firstly, when changing lane I don\'t push hard enough
for it to latch. It indicates until I let go. Secondly, when you
push back the other way to cancel (I never have to do this since
indicators self cancel), you move it one click for off and two to
indicate the other way, obviously.

The point was that this wasn\'t a mechanical switch that could be held
partly on without latching. It was two buttons. Press one and the
indicator comes on and stays on until there is enough movement of the
wheel to cancel. Manual cancel was by pressing the opposite button for a
very short time. It took me about a hundred miles on a motorway to get
the hang of it.

I had an Opel Corsa with a similar design. Traditional stick, but with
no mechanical latch. Electronic logic. But it could be moved soft or
hard. Moving soft it did not latch. Move soft and release, blinked three
times.

But the next Corsa has a traditional mechanical switch again.

I had a Corsa, cheap shit, bottom of the range. The worst model you
could get form GM/Opel/Vauxhall/Holden (why the fuck can\'t they use the
same name worldwide?) I can\'t believe they ever put anything electronic
in a Corsa. I went over a speed bump at only 4 times the speed limit
and snapped the rear axle in half. If there was any justice the council
would have paid for that criminal damage.

The council (rightly) laughs at you, and fines you for speeding. :-DDD

The council operate above the law. Do you think it\'s ok for disabled people to have spinal damage from speedbumps? And yes it does, my Aunt has a bad back and cannot go over a speedbump even at 1mph, it\'s ridiculous. They have to go a different way, or she gets out while he drives over the bump. Fun holding folk up though.

By the way, councils don\'t collect speeding fines, that would be the police. And they\'re too stupid to catch me.

 

[Peeler]

On 20 Feb 2023 00:48:30 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:

That\'s about right.

\"Theodore Dalrymple, a British author, physician, and conservative
political commentator, has written for City Journal that brutalist
structures represent an artefact of European philosophical
totalitarianism, a \"spiritual, intellectual, and moral deformity.\"

You are one to talk (or cite) about spiritual, intellectual and moral
deformity, you abnormal deformed senile blabbermouth!

--
Gossiping \"lowbrowwoman\" about herself:
\"Usenet is my blog... I don\'t give a damn if anyone ever reads my posts
but they are useful in marshaling [sic] my thoughts.\"
MID: <iteioiF60jmU1@mid.individual.net>

 

[Peeler]

On 22 Feb 2023 14:48:36 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> Like many companies we sometimes had summer employees that

Oh, fuck! Now we got TWO abnormal senile bigmouths reminiscing together
about their idiotic past!

--
More of the senile gossip\'s absolutely idiotic senile blather:
\"I stopped for breakfast at a diner in Virginia when the state didn\'t do
DST. I remarked on the time difference and the crusty old waitress said
\'We keep God\'s time in Virginia.\'

I also lived in Ft. Wayne for a while.\"

MID: <t0tjfa$6r5$1@dont-email.me>

BOISTEROUS BRAGGART

 

[NY]

On 15/02/2023 14:56, Commander Kinsey wrote:

On Sun, 12 Feb 2023 20:38:43 -0000, Mark Lloyd <not.email@all.invalid
wrote:

On 2/11/23 04:56, Ian Jackson wrote:

[snip]

Yes. I always understood that down for OFF was safer, because in an
emergency it was a more-natural human action to swipe a switch
downwards.

That \"natural\" could be only because that\'s what you\'re familiar with.

There is only one correct answer here.  Down for on.  Think about it.
Read a book.  You start from the top of the page and go to the bottom as
you read more.  Down is always more.  Right is always more
(accelerator/brake).

I gather than BBC studios use the opposite convention to ITV for the
direction of linear faders on mixing desks: one convention requires you
to push the fader away from you to increase the volume or brightness and
the other requires you to pull it towards you.

The one that I found counter-intuitive was the twist grip on handlebars
for the speed of a motorbike or electric wheelbarrow. I expected to push
the top of the grip away from me to increase speed, so as to bend your
wrist palm-downwards. But it\'s the opposite way (bend your wrist back),
because if you are thrown forwards over the handlebars on the bike, you
want the throttle to close rather than to open. Bloody painful keeping
your wrist bent *backwards*, even just for a few minutes when walking
behind an electric wheelbarrow.

On that topic, Mac and Linux are correct with their dialog boxes, and
Windows is wrong.  (Only time I prefer a Mac (kid\'s toy) or Linux
(geek\'s toy) to Windows).

I\'m not sure which I\'d say was right or wrong with the OK / Cancel
buttons. But having been brought up with Windows, I still catches me out
that Linux is the opposite (not \"wrong\") way.

What about water taps? Most turn anticlockwise to unscrew the tap so as
to increase the pressure, but a few go the opposite way. And there seems
to be no consensus as to whether the cold or the hot tap should be on
the left: doesn\'t matter as long its separate taps with coloured
inserts, but some modern mixer taps, which rotate to vary temperature
and rock back and forth to vary water flow, have no indication as to
which way to rotate to get hot water - and sometimes you have to choose
a rotation arbitrarily and wait: if the water remains cold and never
runs warm after a while, try the other way

 

[Commander Kinsey]

On Wed, 15 Feb 2023 15:33:45 -0000, Carlos E. R. <robin_listas@es.invalid> wrote:

On 2023-02-15 15:51, Commander Kinsey wrote:
On Sun, 12 Feb 2023 13:54:41 -0000, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-02-11 13:24, Commander Kinsey wrote:
On Sat, 11 Feb 2023 12:03:39 -0000, Carlos E.R.
robin_listas@es.invalid> wrote:

On 2023-02-11 10:34, Brian Gaff wrote:
I\'m sure the modern ones will work any way around you wanted. If you
don\'t
like it simply do a head stand before you change them.

My main question, however is why are some breakers so sensitive they
trip
more often than others?
I think they are way too complex now with earth leakage as well as
just
looking for overloads.

Here all houses have mandatorily a whole house RCD. Since many years.

And if you don\'t have one you what? Go to jail?

You do not get electricity.

Remind me never to live in that communist state. It really is none of
anyone\'s business how safe you are.

Yes, it is.

It is not only about you, but any visitor, or anybody living in adjacent
houses.

Yes.... me getting an electric shock could hurt my next door neighbour. Just how stupid are you?

Oh, and the code may go back to a right wing dictator. He hated
communists and killed them, by the many thousands.

Do you mean Hitler? Do you dare not speak his name?

 

[Peeler]

On 20 Feb 2023 03:41:11 GMT, lowbrowwoman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:


> The fun project was a device to electrocute your friends.

The only fun you obviously have in your senile life is when you can listen
to yourself talking, you abnormal senile chatterbox!

--
Yet more of the so very interesting senile blather by lowbrowwoman:
\"My family loaded me into a \'51 Chevy and drove from NY to Seattle and
back in \'52. I\'m alive. The Chevy had a painted steel dashboard with two
little hand prints worn down to the primer because I liked to stand up
and lean on it to see where we were going.\"
MID: <j2kuc1F3ejsU1@mid.individual.net>

 

[Carlos E. R.]

On 2023-02-15 15:51, Commander Kinsey wrote:

On Sun, 12 Feb 2023 13:50:48 -0000, Carlos E.R. <robin_listas@es.invalid> wrote:
On 2023-02-11 15:28, Joe wrote:
On Sat, 11 Feb 2023 13:53:05 -0000 \"Commander Kinsey\" <CK1@nospam.com> wrote:
On Sat, 11 Feb 2023 13:23:55 -0000, Joe <joe@jretrading.com> wrote:
On Sat, 11 Feb 2023 13:15:36 -0000 \"Commander Kinsey\" <CK1@nospam.com> wrote:

What I\'ve never understood is people indicating the wrong way.  I
know someone who can\'t remember which is which - I pointed out you
move the stalk the same way you\'re going too turn then wheel, and
she thought that was some kind of brilliant idea.  And I know
someone else who came up with some crazy reason it\'s best to tell
people you\'re going the other way as somehow lying puts you at an
advantage?

I once drove a BMW (not mine) and the indicators were very clever.
Push in the appropriate direction to turn them on, push the other
way to cancel (e.g. changing lanes where the wheel doesn\'t move
far). However, linger a fraction too long on the cancel, and it
starts indicating the other way...

Sounds stupid.  Firstly, when changing lane I don\'t push hard enough
for it to latch.  It indicates until I let go.  Secondly, when you
push back the other way to cancel (I never have to do this since
indicators self cancel), you move it one click for off and two to
indicate the other way, obviously.

The point was that this wasn\'t a mechanical switch that could be held
partly on without latching. It was two buttons. Press one and the
indicator comes on and stays on until there is enough movement of the
wheel to cancel. Manual cancel was by pressing the opposite button for a
very short time. It took me about a hundred miles on a motorway to get
the hang of it.

I had an Opel Corsa with a similar design. Traditional stick, but with
no mechanical latch. Electronic logic. But it could be moved soft or
hard. Moving soft it did not latch. Move soft and release, blinked three
times.

But the next Corsa has a traditional mechanical switch again.

I had a Corsa, cheap shit, bottom of the range.  The worst model you
could get form GM/Opel/Vauxhall/Holden (why the fuck can\'t they use the
same name worldwide?)  I can\'t believe they ever put anything electronic
in a Corsa.  I went over a speed bump at only 4 times the speed limit
and snapped the rear axle in half.  If there was any justice the council
would have paid for that criminal damage.

The council (rightly) laughs at you, and fines you for speeding. :-DDD

--
Cheers,
Carlos E.R.