Amplifer Design

[Jeroen Belleman]

Cursitor Doom wrote:

On Mon, 14 Oct 2019 05:59:23 -0700, Winfield Hill wrote:

There's a 236MB file of the HP 8565A Operating and Service Manual,
dated 1977, 424 pages, on the web. Unfortunately, it's locked, so I
could not extract the pdf schematic page. But I expanded it, and made
an image of the HV output amp.

https://www.dropbox.com/s/o4tybr81cefbk5n/8565A_amp.GIF?dl=1

And a splendid image it is too. You're obviously way better than me at
enhancement.

The 1st diff-amp stage has 562R emitter and 2k15 collector resistors
for G=3.8. The 2nd stage has 750 + 500-ohm trim emitter resistors and
a current output. The HV output stage has a 19k6 feedback resistor,
for G = 15 to 26, 19 nominal. A 1pF feedback cap would set the video
bandwidth at 8MHz.
I imagine Zout is less than 1k. Push-pull PNP & NPN BJTs, running at
7mA, and dissipating 1 watt, go from 2V to 140V. There are two
complementary amps, for two deflection plates.

It seems odd to me that there's no minus 158V supply for the final
voltage amp. It looks like they're relying solely on attracting the
electron beam from side to side with positive voltages swapping back and
forth between plates rather than a combination of attraction and
repulsion as I would have intuitively expected. :-/

The electrons see only the field, not the potential.

Jeroen Belleman

 

[Winfield Hill]

Cursitor Doom wrote...

On Mon, 14 Oct 2019 05:59:23 -0700, Winfield Hill wrote:

There's a 236MB file of the HP 8565A Operating and Service Manual,
dated 1977, 424 pages, on the web. Unfortunately, it's locked, so I
could not extract the pdf schematic page. But I expanded it, and made
an image of the HV output amp.

https://www.dropbox.com/s/o4tybr81cefbk5n/8565A_amp.GIF?dl=1

And a splendid image it is too. You're obviously way better
than me at enhancement.

The credit belongs to the person who scanned of the manual.
The schematic is on one of those super-wide foldout pages,
which have to be scanned in sections and re-combined. The
pdf's quality is as good or better than my screen capture.

The 1st diff-amp stage has 562R emitter and 2k15 collector resistors
for G=3.8. The 2nd stage has 750 + 500-ohm trim emitter resistors and
a current output. The HV output stage has a 19k6 feedback resistor,
for G = 15 to 26, 19 nominal. A 1pF feedback cap would set the video
bandwidth at 8MHz.
I imagine Zout is less than 1k. Push-pull PNP & NPN BJTs, running at
7mA, and dissipating 1 watt, go from 2V to 140V. There are two
complementary amps, for two deflection plates.

It seems odd to me that there's no minus 158V supply for the
final voltage amp.

The differential current into the output stage summing junction
is -3.6mA, so with the 19k6 feedback resistor, the nominal output
voltage on each side is +70 volts. As one side swings up by +50V
to +120 volts, the other side swings down by -50V to +20 volts.
The deflection electrodes see a nominal 0 volts, and swing from
+100 volts to -100 volts, more or less, set by the gain trimpot.


--
Thanks,
- Win

 

[Winfield Hill]

Winfield Hill wrote...

Winfield Hill wrote...
Cursitor Doom wrote...
On Mon, 14 Oct 2019 05:59:23 -0700, Winfield Hill wrote:

There's a 236MB file of the HP 8565A Operating and Service Manual,
dated 1977, 424 pages, on the web. Unfortunately, it's locked, so I
could not extract the pdf schematic page. But I expanded it, and made
an image of the HV output amp.

https://www.dropbox.com/s/o4tybr81cefbk5n/8565A_amp.GIF?dl=1

The 1st diff-amp stage has 562R emitter and 2k15 collector resistors
for G=3.8. The 2nd stage has 750 + 500-ohm trim emitter resistors and
a current output. The HV output stage has a 19k6 feedback resistor,
for G = 15 to 26, 19 nominal. A 1pF feedback cap would set the video
bandwidth at 8MHz.
I imagine Zout is less than 1k. Push-pull PNP & NPN BJTs, running
at 7mA, and dissipating 1 watt, go from 2V to 140V. There are two
complementary amps, for two deflection plates.

It seems odd to me that there's no minus 158V supply for the
final voltage amp.

The differential current into the output stage summing junction
is -3.6mA, so with the 19k6 feedback resistor, the nominal output
voltage on each side is +70 volts. As one side swings up by +50V
to +120 volts, the other side swings down by -50V to +20 volts.
The deflection electrodes see a nominal 0 volts, and swing from
+100 volts to -100 volts, more or less, set by the gain trimpot.

That's a net peak-peak deflection-voltage swing (difference) of
200 volts, or nearly 300 Vpp at the amplifier's extreme limits.
The 7mA current output capability of the amplifier means, if the
plate capacitive load, plus the two BJT's Cob, is say 30pF, that
the maximum output slew rate is S=i/C = 230V/us. Therefore it
can slew the p-p voltage of 200V in under 1 us. That's a pretty
respectable performance for a simple, low-cost circuit in 1977.

The video output-stage's modest 1-watt class-A power dissipation
is nominally divided between the two BJT's, but a fault situation
could force most of it to be in one part. That's too much power
for a modern TO-92 or SOT-23 type, but the metal-can parts in the
old days had no problem. Furthermore, a clip-on heat sink could
easily be added. HP affixed rather large ones to the TO-39 parts.
HP only gives HP numbers, but it's safe to say the manufacturer's
original is no longer available. Now I struggle with high-voltage
SOT-223 or TO-126 parts for my HV amplifiers, if I can find them.


--
Thanks,
- Win

 

[Cursitor Doom]

On Mon, 14 Oct 2019 07:59:44 -0700, Winfield Hill wrote:

The differential current into the output stage summing junction is
-3.6mA, so with the 19k6 feedback resistor, the nominal output voltage
on each side is +70 volts. As one side swings up by +50V to +120
volts, the other side swings down by -50V to +20 volts. The deflection
electrodes see a nominal 0 volts, and swing from +100 volts to -100
volts, more or less, set by the gain trimpot.

OK, many thanks for that. Whilst I'm absorbing your analysis, I've
discovered a problem with Q8. The base-emitter and base-collector
voltages are both around -0.68V and static. OTOH, Q8's compliment Q13 has
base-emitter voltage of 0.5 - 0.7V cycling steadily in line with the
timebase as it should and a healthy base-collector voltage of ~11V.
Clearly Q8 can't operate with those voltages and it looks like it's got a
significant C-E internal short. Can't say for certain without hooking it
out of circuit, but there's not much else in that area it could be!



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[Winfield Hill]

Winfield Hill wrote...

Cursitor Doom wrote...

On Mon, 14 Oct 2019 05:59:23 -0700, Winfield Hill wrote:

There's a 236MB file of the HP 8565A Operating and Service Manual,
dated 1977, 424 pages, on the web. Unfortunately, it's locked, so I
could not extract the pdf schematic page. But I expanded it, and made
an image of the HV output amp.

https://www.dropbox.com/s/o4tybr81cefbk5n/8565A_amp.GIF?dl=1

And a splendid image it is too. You're obviously way better
than me at enhancement.

The credit belongs to the person who scanned of the manual.
The schematic is on one of those super-wide foldout pages,
which have to be scanned in sections and re-combined. The
pdf's quality is as good or better than my screen capture.

The 1st diff-amp stage has 562R emitter and 2k15 collector resistors
for G=3.8. The 2nd stage has 750 + 500-ohm trim emitter resistors and
a current output. The HV output stage has a 19k6 feedback resistor,
for G = 15 to 26, 19 nominal. A 1pF feedback cap would set the video
bandwidth at 8MHz.
I imagine Zout is less than 1k. Push-pull PNP & NPN BJTs, running
at 7mA, and dissipating 1 watt, go from 2V to 140V. There are two
complementary amps, for two deflection plates.

It seems odd to me that there's no minus 158V supply for the
final voltage amp.

The differential current into the output stage summing junction
is -3.6mA, so with the 19k6 feedback resistor, the nominal output
voltage on each side is +70 volts. As one side swings up by +50V
to +120 volts, the other side swings down by -50V to +20 volts.
The deflection electrodes see a nominal 0 volts, and swing from
+100 volts to -100 volts, more or less, set by the gain trimpot.

That's a net peak-peak deflection-voltage swing (difference) of
200 volts, or nearly 300 Vpp at the amplifier's extreme limits.
The 7mA current output capability of the amplifier means, if the
plate capacitive load, plus the two BJT's Cob, is say 30pF, that
the maximum output slew rate is S=i/C = 230V/us. Therefore it
can slew the p-p voltage of 200V in under 1 us. That's a pretty
respectable performance for a simple, low-cost circuit in 1977.


--
Thanks,
- Win

 

[Cursitor Doom]

On Mon, 14 Oct 2019 08:45:59 -0700, Winfield Hill wrote:

That's a net peak-peak deflection-voltage swing (difference) of 200
volts, or nearly 300 Vpp at the amplifier's extreme limits. The 7mA
current output capability of the amplifier means, if the plate
capacitive load, plus the two BJT's Cob, is say 30pF, that the maximum
output slew rate is S=i/C = 230V/us. Therefore it can slew the p-p
voltage of 200V in under 1 us. That's a pretty respectable performance
for a simple, low-cost circuit in 1977.

Indeed. In fact I think IIRC I read somewhere that CRTs beat liquid
crystal hands down in this regard - although that's more to do with the
superb agility of an electron beam I would imagine.



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[Jan Panteltje]

On a sunny day (Mon, 14 Oct 2019 15:55:55 -0000 (UTC)) it happened Cursitor
Doom <curd@notformail.com> wrote in <qo25qa$kaj$2@dont-email.me>:

On Mon, 14 Oct 2019 08:45:59 -0700, Winfield Hill wrote:

That's a net peak-peak deflection-voltage swing (difference) of 200
volts, or nearly 300 Vpp at the amplifier's extreme limits. The 7mA
current output capability of the amplifier means, if the plate
capacitive load, plus the two BJT's Cob, is say 30pF, that the maximum
output slew rate is S=i/C = 230V/us. Therefore it can slew the p-p
voltage of 200V in under 1 us. That's a pretty respectable performance
for a simple, low-cost circuit in 1977.

Indeed. In fact I think IIRC I read somewhere that CRTs beat liquid
crystal hands down in this regard - although that's more to do with the
superb agility of an electron beam I would imagine.

In fact it is not very good for those years
Look up a Tek from those days,
One big difference is that the modern tubes in those days had a much higher sensitivity,
Maybe 20 Vpp or so for FSD.
I build a 300 MHz scope in 1976 or there about using a circuit diagram that somebody
at Tek (accidently) published, met the guy later, he got headwind for that
nice circuit though. I used an east European tube.

As to LCD, that works totally different:
Signal is digitized (at what ever speed) put into a memory,
and that memory can be read out and put in the LCD display's memory.
the LCD controller reads that LCD memory at its own (usually much slower) speed
and refreshes the LCD display. (even if there is no more signal on the scope input),
this gives you already 'storage'.

Also you can that do signal processing such as Fourier transform on the data in that memory.
That is also what I do with scope_pic, there only 256 bytes of memory available in the PIC....
http://panteltje.com/panteltje/pic/scope_pic/index.html
But it is also the reason digital scopes lie.
With digitizing comes aliasing and all sorts of unwanted effects.

I hold on to my old 10 MHz Trio analog scope
With a bit of clever use it is all I need (and I work with GHz stuff)
heterodyne (down-mix), or use a RTL_SDR USB stick as spectrum analyzer (<30 $):
http://panteltje.com/panteltje/xpsa/index.html
Looking at signals 2.4 GHz with a down mixer is then also no problem
Or without down-mixer at around 1.5 GHz in real time.
Even decoded GPS with that:
http://michelebavaro.blogspot.com/2012/04/spring-news-in-gnss-and-sdr-domain.html
scroll all the way down to my entry.
Good stuff does not need to cost much,
most of those 'boat-anchors' are not even good at anchoring...
Spectrum often tells you a lot.

As to diff amplifiers:
The output depends on the difference_ between the inputs,
so if one input is at a fixed voltage and the other changes,
then there is a difference between the inputs created.
If both inputs move the same way wit the same amplitude there is no difference (and no output)
All within a reasonable range between the supply rails of course, or at least it should be.

 

[Cursitor Doom]

On Mon, 14 Oct 2019 09:20:46 -0700, Winfield Hill wrote:

The video output-stage's modest 1-watt class-A power dissipation is
nominally divided between the two BJT's, but a fault situation could
force most of it to be in one part. That's too much power for a modern
TO-92 or SOT-23 type, but the metal-can parts in the old days had no
problem. Furthermore, a clip-on heat sink could easily be added. HP
affixed rather large ones to the TO-39 parts.

Indeed they did. Here's the board in question and you can't miss the four
final transistors with their rather generously-proportioned heat sinks:

https://yandex.com/collections/card/5da4bb75ada5960091318610/

This is the kind of layout I like: no smds and plenty of space between
the components to probe connections. I can't do that with anything built
after SMDs came in, I lack the fine motor skills required.

HP only gives HP numbers, but it's safe to say the manufacturer's
original is no longer available. Now I struggle with high-voltage
SOT-223 or TO-126 parts for my HV amplifiers, if I can find them.

They have an odd practice of quoting either one or the other. So the
first four TO-18 tin can transistors are shown as 2N3251 devices, but the
next stage uses "4-404 826" BJTs and goodness knows what they are. I'm
not even going to bother to stick that into Google because I know it
won't throw up anything helpful at all. But on the plus side, I know
enough about the functioning of the circuit now to be able to drop a
couple of closely-matched jellybeans in there in place of Q8 and Q13 and
in this x-amp at any rate, given its modest task, will quickly be back in
business again. All this old vintage stuff remains so readily
serviceable.





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[Cursitor Doom]

On Mon, 14 Oct 2019 17:16:12 +0000, Jan Panteltje wrote:

I hold on to my old 10 MHz Trio analog scope
With a bit of clever use it is all I need (and I work with GHz stuff)
heterodyne (down-mix), or use a RTL_SDR USB stick as spectrum analyzer
(<30 $):
http://panteltje.com/panteltje/xpsa/index.html
Looking at signals 2.4 GHz with a down mixer is then also no problem Or
without down-mixer at around 1.5 GHz in real time.

I really, really admire your resourcefulness, Jan. You clearly have an
excellent grasp of your subject. However, why make life hard for
yourself? I mean a 10Mhz scope and mixing down??? If you're working with
GHz stuff then surely you can afford something a lot better than that! I
had a Belgian friend once many years ago and he frequently said the Dutch
were "careful with their money" (shall I say it tactfully) and here you
are now proving it! :-D



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[Jan Panteltje]

On a sunny day (Mon, 14 Oct 2019 18:31:55 -0000 (UTC)) it happened Cursitor
Doom <curd@notformail.com> wrote in <qo2eur$4sq$2@dont-email.me>:

On Mon, 14 Oct 2019 17:16:12 +0000, Jan Panteltje wrote:

I hold on to my old 10 MHz Trio analog scope
With a bit of clever use it is all I need (and I work with GHz stuff)
heterodyne (down-mix), or use a RTL_SDR USB stick as spectrum analyzer
(<30 $):
http://panteltje.com/panteltje/xpsa/index.html
Looking at signals 2.4 GHz with a down mixer is then also no problem Or
without down-mixer at around 1.5 GHz in real time.

I really, really admire your resourcefulness, Jan. You clearly have an
excellent grasp of your subject. However, why make life hard for
yourself? I mean a 10Mhz scope and mixing down??? If you're working with
GHz stuff then surely you can afford something a lot better than that! I
had a Belgian friend once many years ago and he frequently said the Dutch
were "careful with their money" (shall I say it tactfully) and here you
are now proving it! :-D

Na...
farmers are revolving here against being forced by the government to cut there herd to save on CO2..
They occupied gov buildings and got what they wanted...
https://www.nu.nl/binnenland/6004031/boeren-forceren-deur-provinciehuis-groningen-tijdens-stikstofprotest.html

I was not referring to mixing down to the 10 MHz.
I was referring to mixing down 2.4 GHz to 1.5 GHz or so for use with an RTL_SDR USB stick as spectrum analyzer,
that I did.
OTOH if you scope the 470 kHz or 9 MHz IF of a shortwave radio with a 10 MHz scope then
you can see a lot about the modulation.
It is the experimenter, not the instrument.
I do remember .. well getting big boat_anchors in your shop may impress potential customers

You never say what you want to do with your 'instrument'
if you are a collector OK...

My suggestion to you is: design one.
Start designing a simple scope, look at how others did it, take it from there.

So, as to GHz:
https://www.ebay.com/itm/272411458376
much more fun to play with than old boat_anchors.
that is what my xpsa spectrum analyzer software runs on.
Plus a hundred other things, AIS, planes, radio, TV. etc etc.
High speed IQ sampling.
1 pmm... frequency measurement, what not.

Build something.

 

[Cursitor Doom]

On Tue, 15 Oct 2019 08:20:20 +0000, Jan Panteltje wrote:

Na...
farmers are revolving here against being forced by the government to cut
there herd to save on CO2..

Ludicrous.

I was not referring to mixing down to the 10 MHz.
I was referring to mixing down 2.4 GHz to 1.5 GHz or so for use with an
RTL_SDR USB stick as spectrum analyzer,
that I did.

I couldn't possibly bring myself to use such a device. Those things are
an abomination in the sight of God. I only ever use massive, discrete
items of test equipment that are terribly inefficient and require a *lot*
of bench space to set up and operate. I wish I could be more like you in
this respect, but I can't.

I do remember .. well getting big boat_anchors in your shop may impress
potential customers

I seem to exhibit a magnetic attraction towards boatanchors and the
heavier and bulkier they are the stronger the attraction. A bit like
gravity.

You never say what you want to do with your 'instrument'
if you are a collector OK...

Metrology has always been a major interest of mine, ergo anything that
measures something else is ripe for acquisition. This fascination goes
back a long, long, long, long way and probably stems from late 50s/early
60s sci-fi films.

My suggestion to you is: design one.
Start designing a simple scope, look at how others did it, take it from
there.
Build something.

That's an excellent suggestion for an intermediate level electronics
student, Jan. There are so many key aspects of the subject that one can
learn from building such an instrument. In my case, however, that would
be absolutely inexcusable behaviour as I already have 13 commercial
scopes and I need to get rid of at least ten of them.
Any other suggestions?



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[Chris]

On Mon, 14 Oct 2019 18:25:55 +0000, Cursitor Doom wrote:

But on the plus side, I know
enough about the functioning of the circuit now to be able to drop a
couple of closely-matched jellybeans in there in place of Q8 and Q13 and
in this x-amp at any rate, given its modest task, will quickly be back
in business again.

Why change both if only one has failed??

 

[Winfield Hill]

Cursitor Doom wrote...

... drop a couple of closely-matched jellybeans in
there in place of Q8 and Q13 and in this x-amp at
any rate, given its modest task, will quickly be
back in business again.

The two BJTs are npn and pnp types and cannot easily
be closely matched, nor do they need to be.** Plop
some parts in there and let us know what happens.

** Recenter the screen with the HORIZ POSN control.


--
Thanks,
- Win

 

It wants a sign in or something so I will never see it unless you get some hosting. I was going to but I figured I don't really want to show people shit anyway.

It is not complimentary it is differential. Don't conflate the two and maybe you'll get it.

 

[Jan Panteltje]

On a sunny day (Tue, 15 Oct 2019 17:21:46 -0000 (UTC)) it happened Cursitor
Doom <curd@notformail.com> wrote in <qo4v7a$4vu$1@dont-email.me>:

On Tue, 15 Oct 2019 08:20:20 +0000, Jan Panteltje wrote:

Na...
farmers are revolving here against being forced by the government to cut
there herd to save on CO2..

Ludicrous.

Very powerful, today they are blocking main highways by driving trackers
(thousands) side by side on all lanes...

The army has been called in in The Hague to keep them from getting to the city center.

Let us be real, the anthropogenic climate hoax forces people to do huge investments
and damages business.
I am with the farmers 100%!

So better invest in higher dikes and more power stations for aircos etc while it is still possible
and technology is not lost..
Eventually climate driven mass migration will cause major changes in human population.

I was not referring to mixing down to the 10 MHz.
I was referring to mixing down 2.4 GHz to 1.5 GHz or so for use with an
RTL_SDR USB stick as spectrum analyzer,
that I did.

I couldn't possibly bring myself to use such a device. Those things are
an abomination in the sight of God.

Do you have a cellphone?
As a kid we tried two empty cans with a stretched wire in between as walky-talky

I only ever use massive, discrete
items of test equipment that are terribly inefficient and require a *lot*
of bench space to set up and operate. I wish I could be more like you in
this respect, but I can't.

I do remember .. well getting big boat_anchors in your shop may impress
potential customers

I seem to exhibit a magnetic attraction towards boatanchors and the
heavier and bulkier they are the stronger the attraction. A bit like
gravity.

You never say what you want to do with your 'instrument'
if you are a collector OK...

Metrology has always been a major interest of mine, ergo anything that
measures something else is ripe for acquisition. This fascination goes
back a long, long, long, long way and probably stems from late 50s/early
60s sci-fi films.

Seems we are from similar ages yes, but me myself I was happy when transistors
became available..
I never had much test equipment, what came was what I build myself..
Later at work we had nearly unlimited equipment (National TV network),
hundreds of scopes, Teks, vector-scopes, any test equipment you can imagine..
I had fun in my school days building my own scope and then later designing some myself.

My suggestion to you is: design one.
Start designing a simple scope, look at how others did it, take it from
there.
Build something.

That's an excellent suggestion for an intermediate level electronics
student, Jan. There are so many key aspects of the subject that one can
learn from building such an instrument. In my case, however, that would
be absolutely inexcusable behaviour as I already have 13 commercial
scopes and I need to get rid of at least ten of them.
Any other suggestions?

LOL
not everybody is the same, I am fighting with software.
Real fun, my systems got attacked by one of the most evil ones, the well known Jan Panteltje.
I bought a 2400 W water boiler, for coffee that is.
Plugging it in did indeed boil 1.5 liter water in about 3 minutes, but it also caused a dip in the mains
that in turn caused my main PC reiserfs to see bad sectors,
Rescue failed.
Disk works OK now but lost lots of data, yes I make backups, but not of everything,
so I moved to the laptop now as main PC while thinking what to do with the rest.
One can buy a no-break supply, but maybe I will simply buy some more hyper super laptops
as those have automatic battery backup...
All that to make more coffee real quick, and actually: Coffee or caffeine does NOT keep you awake I found.
Or maybe I will just add some Raspberries running from some huge lifepo4 cells connected to my solar panel.

When government is replaced by angry farmers and temperatures reach boiling point due to climate change
I will ask Elon for a seat on his next mars mission.
It would be just the same situation, hopefully he brings a nuclear reactor along for the water maker.

 

[Cursitor Doom]

On Tue, 15 Oct 2019 18:43:09 -0700, Winfield Hill wrote:

Cursitor Doom wrote...

... drop a couple of closely-matched jellybeans in there in place of Q8
and Q13 and in this x-amp at any rate, given its modest task, will
quickly be back in business again.

The two BJTs are npn and pnp types and cannot easily be closely
matched, nor do they need to be.** Plop some parts in there and let us
know what happens.

** Recenter the screen with the HORIZ POSN control.

Indeed so. I'm guessing the hardest part is going to be finding PNPs in
my junk box that are fast enough. And I have a *massive* junk box. But
for some reason it never seems to be quite massive enough.



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[Cursitor Doom]

On Wed, 16 Oct 2019 07:31:21 +0000, Jan Panteltje wrote:

I bought a 2400 W water boiler, for coffee that is.
Plugging it in did indeed boil 1.5 liter water in about 3 minutes, but
it also caused a dip in the mains that in turn caused my main PC
reiserfs to see bad sectors,
Rescue failed.

Sorry to hear that; serious PITA. Try plugging in your kettle to an
outlet on the opposite side of your house/apartment. Line impedance is
your friend. ;-)



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[Martin Brown]

On 16/10/2019 12:49, tabbypurr@gmail.com wrote:

On Wednesday, 16 October 2019 12:01:51 UTC+1, Cursitor Doom wrote:
On Wed, 16 Oct 2019 07:31:21 +0000, Jan Panteltje wrote:

I bought a 2400 W water boiler, for coffee that is.
Plugging it in did indeed boil 1.5 liter water in about 3 minutes, but
it also caused a dip in the mains that in turn caused my main PC
reiserfs to see bad sectors,
Rescue failed.

Sorry to hear that; serious PITA. Try plugging in your kettle to an
outlet on the opposite side of your house/apartment. Line impedance is
your friend. ;-)

so many failures are due to water haters being unnecessarily powerful.

Why? Does rabies make them bite into the mains cable?

--
Regards,
Martin Brown

 

On Wednesday, 16 October 2019 12:01:51 UTC+1, Cursitor Doom wrote:

On Wed, 16 Oct 2019 07:31:21 +0000, Jan Panteltje wrote:

I bought a 2400 W water boiler, for coffee that is.
Plugging it in did indeed boil 1.5 liter water in about 3 minutes, but
it also caused a dip in the mains that in turn caused my main PC
reiserfs to see bad sectors,
Rescue failed.

Sorry to hear that; serious PITA. Try plugging in your kettle to an
outlet on the opposite side of your house/apartment. Line impedance is
your friend. ;-)

so many failures are due to water haters being unnecessarily powerful.


NT

 

[Cursitor Doom]

On Tue, 15 Oct 2019 08:20:20 +0000, Jan Panteltje wrote:

Na...
farmers are revolving here against being forced by the government to cut
there herd to save on CO2..
They occupied gov buildings and got what they wanted...
https://www.nu.nl/binnenland/6004031/boeren-forceren-deur-
provinciehuis-groningen-tijdens-stikstofprotest.html

Got it here in English from a trusted news site:

https://www.breitbart.com/europe/2019/10/16/incredible-pictures-thousands-
of-tractors-shut-down-highways-in-farmers-anti-green-madness-protest/

Good for them! Someone needs to take a stand against this Globalist
madness. Those bastards will never be happy until we're all eating
insects - and that's no exaggeration. They're already trying to make it
an acceptable alternative source of protein. But *they* won't be eating
any flies, oh no. It'll be the finest steak reserved just for them. Such
is the way these self-entitled 'elites' think.


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