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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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12th Apr 2018, 1:31 pm | #1 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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The Cyclops
i am working on a vidicon camera the idea is to make it also multi system same as the PMT camera and my Thylacine monitor .
http://www.taswegian.com/NBTV/forum/...hp?f=15&t=2564 |
11th Jun 2018, 11:43 am | #2 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: The Cyclops
https://www.youtube.com/watch?v=0QdIi2ijr28
Had a problems for a few weeks on the head amp but ended up using Late Peter Yanczer's pmt camera preamp for the vidicon worked fine , a work in progress getting there . |
13th Jun 2018, 5:24 pm | #3 | |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: The Cyclops
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there's something about your posts that doesn't quite invite people to get involved. So, like in this case, you're announcing a circuit for a video pre-amp to fix a problem, only there's nothing to anchor that to - no-one knows there was a problem in the first place., or the significance of that problem to you. Also, there are tighter and tighter circles on here that are purely interested in or versed in video circuits - I for example have no idea who Pete Lanczer was - and if you want to widen up the audience, it's worth stating the relevance of the problem in more general electronics or historic terms. Could you maybe start something in Homebrew Projects, only put a nice, clear bit of narrative up there with it, so that a thread can develop and keep going? Even on a technical forum like this, people usually respond more to the personal story that is about the person doing the fixing, than the object behind the person. So what challenges there are or have been to overcome, what frustrations arise, what inventiveness, ingenuity, patience, etc are displayed in the process - all these things are what get our interest going more than about the thing itself, however amazing it is. That's just my sense of how most people respond and I think your work deserves to have more response!
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Al |
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15th Jun 2018, 11:39 am | #4 | |||||||
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: The Cyclops
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Have to go to the NBTV forum forum for this . https://www.taswegian.com/NBTV/forum...2+drum+monitor Quote:
https://www.taswegian.com/NBTV/forum...hp?f=23&t=1318 Quote:
No worries good advice too ,i just like to work on the vintage idea of television old school working around what existed and what was missed out on ,i did a lot of mechanical television projects but of late working on the electronic side of it as here with the cyclops vidicon ,the image tube is a device that i have failed on a few times and i now know it was pretty much the preamplifier that kicked in in he bum the other times i tried . Cameras are very hard made a few Mechanical low def tv cameras in the past they were fun . this Vidicon is the first i have got an image out of an image tube apart from a PMT .https://www.taswegian.com/NBTV/forum/viewforum.php?f=20 Thanks for the reply Harry Last edited by dalekmoore2007; 15th Jun 2018 at 11:52 am. |
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15th Jun 2018, 4:41 pm | #5 | |
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,534
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Re: The Cyclops
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The first one, seen on the tripod, used a pierced gramophone record as the scanning disc and was 'two-colour' with a club photocell for the red end and a phomultiplier for the blue. At the receiver, there was a pot mixing the red and blue channels, to produce a sort of artificial 'green'. This worked a bit like a tint control and could give surprisingly convincing results. The other one shown here: the 'big box', gave full colour RGB pictures. This used a laser-cut stainless steel scanning disc and three photomultipliers as pick-up tubes, including a special one which was red sensitive, having been very kindly supplied by Sean Williams (a poster on this board). I think it was Brian Summers who supplied the dichroic splitter block - also very kind. Note the odd-looking 'test card' below. Yes, as Harry says, colour cameras are hard to do with mechanical NBTV, mainly because when you try to mix the coloured light channels evenly - this reduces still further the dire sensitivity obtained when using a Nipkow Disc. Steve |
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16th Jun 2018, 9:46 am | #6 | |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: The Cyclops
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I love the PMT tube as a device got a lot of ideas for my cameras from your build . Funny at the moment my PMT nipkow camera pretty much could out do the cyclops Vidicon at 32 line the mechanical ones line rate is stuck on 32 line unless i make higher line rate nipkow disk . http://www.taswegian.com/NBTV/forum/...lit=pmt+camera some mechanical camera results animated gifs http://www.taswegian.com/NBTV/forum/...mera&start=135 The cyclops to days video recordings http://www.taswegian.com/NBTV/forum/...p=23614#p23614 Last edited by dalekmoore2007; 16th Jun 2018 at 10:06 am. |
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24th Jul 2018, 6:54 am | #7 |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: The Cyclops
End results of the Cyclops ....has been put away now for a while ..i found at the end the deflection yoke was too large or long for the Vidicon causing a doubling over of the scan .
It was a good teaching tool for me as i always wanted to get one of these things to work . https://www.youtube.com/watch?v=pRjC9Wh4-m4&t=67s Last edited by dalekmoore2007; 24th Jul 2018 at 6:59 am. |