How did the CRT work? How did it produce a picture 90 degrees to the actual neck?
Those flat(ish) CRTs were used in at least one design of video
entry-phone system for flats.
On Tue, 28 Mar 2023 00:27:16 +0100 (GMT+01:00)
"Graham. " <I.need.a.us...@gmail.com> wrote:
Those flat(ish) CRTs were used in at least one design of video
entry-phone system for flats.
I met Clive Sinclair when I was asked to test Class-D amplifier for the Stern-Clyne group.
It was supposed to deliver 10 watts from tiny transistors.
It may have done but the distortion was unbearable.
When we told Sir Clive, he said pop round and demonstrate it.
We did and discovered that he couldn't hear it!
In fact he bought our test set up there and then!
Very nice man. Self taught!
--
Mint 20.3, kernel 5.4.0-139-generic, Cinnamon 5.2.7
running on an AMD Phenom II X4 Black edition processor with 16GB of DRAM.
One claimed advantage was that the screen being at the back could be mounted on a big heat sink and the tube used for projection, however AFAIK it never managed colour.
On 29/03/2023 10:02, R. Mark Clayton wrote:
One claimed advantage was that the screen being at the back could be mounted on a big heat sink and the tube used for projection, however AFAIK it never managed colour.I think the shadow mask would have seriously obstructed the light from
the phosphors.
On 27/03/2023 11:34, Brian Gaff wrote:
How did the CRT work? How did it produce a picture 90 degrees to the
actual
neck?
You mean Pocket TV, not Microvision. According to <https://www.youtube.com/watch?v=w3SbEZazxVY> there is a transparent, negatively charged, electrode, in front of the screen, that deflects the electron beam away from the viewer.
(The Microvision appears to have had normal tubes.)
On Wednesday, 29 March 2023 at 14:02:25 UTC+1, David Woolley wrote:
On 29/03/2023 10:02, R. Mark Clayton wrote:
One claimed advantage was that the screen being at the back could beI think the shadow mask would have seriously obstructed the light from
mounted on a big heat sink and the tube used for projection, however
AFAIK it never managed colour.
the phosphors.
Tricky too making one for an oblique beam, however something like
Trinitron might have worked. Alas this was patent protected until 1996.
On Tue, 28 Mar 2023 00:27:16 +0100 (GMT+01:00)
"Graham. " <I.need.a.usenet.client@gmail.com> wrote:
Those flat(ish) CRTs were used in at least one design of video
entry-phone system for flats.
I met Clive Sinclair when I was asked to test Class-D amplifier for the Stern-Clyne group.
It was supposed to deliver 10 watts from tiny transistors.
It may have done but the distortion was unbearable.
When we told Sir Clive, he said pop round and demonstrate it.
We did and discovered that he couldn't hear it!
In fact he bought our test set up there and then!
Very nice man. Self taught!
--
Mint 20.3, kernel 5.4.0-139-generic, Cinnamon 5.2.7
running on an AMD Phenom II X4 Black edition processor with 16GB of DRAM.
On Tue, 28 Mar 2023 00:27:16 +0100 (GMT+01:00)
"Graham. " <I.need.a.us...@gmail.com> wrote:
Those flat(ish) CRTs were used in at least one design of video
entry-phone system for flats.
I met Clive Sinclair when I was asked to test Class-D amplifier for the Stern-Clyne group.
It was supposed to deliver 10 watts from tiny transistors.
It may have done but the distortion was unbearable.
When we told Sir Clive, he said pop round and demonstrate it.
We did and discovered that he couldn't hear it!
In fact he bought our test set up there and then!
Very nice man. Self taught!
--
Mint 20.3, kernel 5.4.0-139-generic, Cinnamon 5.2.7
running on an AMD Phenom II X4 Black edition processor with 16GB of DRAM.
Then there was the C5. It was intended as a fun vehicle for the summer. Sadly his bank had had enough, and wanted their money back, so it was launched at Alexandra Palace in the middle of a snow storm. Given that it only drove oone rear wheel from the motor, it was white and therefore not really visible, the press had a field day, sending it up. I was there, but only found out later that he had been forced to sell it ahead of Christmas by the bankers.
On 30/03/2023 10:04, Brian Gaff wrote:
Then there was the C5. It was intended as a fun vehicle for the summer.
Sadly his bank had had enough, and wanted their money back, so it was
launched at Alexandra Palace in the middle of a snow storm. Given that it
only drove oone rear wheel from the motor, it was white and therefore not
really visible, the press had a field day, sending it up. I was there,
but
only found out later that he had been forced to sell it ahead of
Christmas
by the bankers.
I don't think I ever saw one under electric power. I saw one being
pedalled once,
and, regularly, one being hauled up a long hill with a rope.
Then there was the C5. It was intended as a fun vehicle for the summer. Sadly his bank had had enough, and wanted their money back, so it was launched at Alexandra Palace in the middle of a snow storm. Given that it only drove oone rear wheel from the motor, it was white and therefore not really visible, the press had a field day, sending it up. I was there, but only found out later that he had been forced to sell it ahead of Christmas by the bankers.
"Max Demian" <max_demian@bigfoot.com> wrote in message news:u0eg8f$2uvhq$4@dont-email.me...
On 30/03/2023 10:04, Brian Gaff wrote:
Then there was the C5. It was intended as a fun vehicle for the
summer.
Sadly his bank had had enough, and wanted their money back, so it was
launched at Alexandra Palace in the middle of a snow storm. Given
that it
only drove oone rear wheel from the motor, it was white and therefore
not
really visible, the press had a field day, sending it up. I was
there, but
only found out later that he had been forced to sell it ahead of
Christmas
by the bankers.
I don't think I ever saw one under electric power. I saw one being
pedalled once,
and, regularly, one being hauled up a long hill with a rope.
What, being towed behind a vehicle, or connected to static motor/engine
at the top of the hill (*) which gradually pulled the C5 closer to it?
Were C5s designed like modern "pedelec" bicycles, in that you could
pedal with electrical assistance, or were the all-electric or else
all-pedal, with no combined power? How much mechanical resistance did
the motor impose when you were pedalling, given that presumably there
was a reduction gear between the motor and wheels which would have
magnified any friction in the motor when being driven "in reverse"
(wheels driving motor).
What scared me, and a lot of other people, about the C5 was the height.
Below car bonnet level.
Which meant below a lot of driver's lines of sight.
Add in that it was slower than a pedal cycle...
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