That's very encouraging - if it can go far enough to sync it's probably
usable.
By all means try adding some capacitance to the timing caps. Just turn it
off quickly if it refuses to oscillate - it might be warming up the line
driver transistor. You shouldn't need to adjust the vertical stuff at
Hi all,
I got it working... somewhat! I hooked the Raspberry Pi's NTSC composite
up to the LM1881 sync separator, and after fiddling with the horizontal
hold it snapped into place. A few problems:
* As mentioned before, the screen coverage is a bit poor (lots of
space to the left and
On 2021-04-14 10:02 a.m., Adrian Godwin wrote:
> No, they often have a Z modulation input and many have a TV sync, so
> you'd only need to add a vertical scan. But tube depth is a problem.
> Green isn't, though !
>
> On Wed, Apr 14, 2021 at 2:44 PM jb-electronics
>
No, they often have a Z modulation input and many have a TV sync, so you'd
only need to add a vertical scan. But tube depth is a problem. Green isn't,
though !
On Wed, Apr 14, 2021 at 2:44 PM jb-electronics
wrote:
> It's a good idea, but these scope tubes are too deep and don't have a
>
It's a good idea, but these scope tubes are too deep and don't have a
composite input usually (but x/y deflection setup). I am trying to build
a luggable computer (think Osborne I).
Jens
On 2021-04-13 9:05 p.m., Adrian Godwin wrote:
Could you use an old 'scope ? Or would it be too big ?
On
Could you use an old 'scope ? Or would it be too big ?
On Tue, Apr 13, 2021 at 10:57 PM jb-electronics
wrote:
> Hey all,
>
> I am looking for a 5"-6" monochrome CRT, preferable green or amber, with
> composite video input. If anybody has one for sale, please let me know!
>
> Best wishes
> Jens
> On Apr 13, 2021, at 2:09 PM, Robert G. Schaffrath
> wrote:
>
> Big problem these days is where to get an NTSC video source. The only things
> I currently have left are an old 8mm camcorder and a digital to NTSC
> converter box that were common when the US went all digital.
FYI: if you
Hey all,
I am looking for a 5"-6" monochrome CRT, preferable green or amber, with
composite video input. If anybody has one for sale, please let me know!
Best wishes
Jens
On 2021-04-13 8:41 a.m., 'John Rehwinkel' via neonixie-l wrote:
I'm not saying don't try it - it would be very
VCRs and older game consoles (like the original XBOX) will provide NTSC via
their AV output. Some of the newer TVs dont even have composite video
jacks, so the standard is rapidly dying.
Too bad, because studio-quality NTSC is actually very crisp; it's the
transmission medium and receivers
Back in the 1990's I purchased new surplus CRT based viewfinder module
designed for a camcorder from a surplus electronics vendor. Was rather
inexpensive. It has a tiny 1" B CRT and takes composite NTSC video. The
only issue with it was the image was mirrored due to it being designed to
be
> I'm not saying don't try it - it would be very educational, though best if
> you can get hold of a schematic. But a lot easier to get hold of an NTSC
> monitor, I think. The people who maintain arcade machines have been scraping
> up all the large colour monitors recently but I doubt they'd
On 2021-04-12 8:59 a.m., Adrian Godwin wrote:
To complete the trio : SECAM is Something Essentialy Contrary to the
American Method, and PAL is Perfection At Last.
I recall hearing it as "Pay (for) Additional Luxury".
the early sets would have needed extra circuitry to decode the
alternating
On Mon, Apr 12, 2021 at 1:34 PM Robert G. Schaffrath <
robert.schaffr...@gmail.com> wrote:
> locking on). NTSC (Never Twice the Same Color) was a bit of an issue with
> needing Color and Hue controls that adjusted the TV's
>
To complete the trio : SECAM is Something Essential Contrary to the
Yes the work done to get color into the 3.58MHz (well something
like 3.579545MHz) was incredible. The math involved in transmitting the RGB
info is truly amazing. And it was all decoded through analog circuitry! No
digital processing involved. Quite a feat for its day. In fact, NTSC TV's
were
The line oscillator has to run close to the line frequency and is then
phase-locked to it by the horizontal hold mechanism. If the oscillator is
tuned for 19kHz it's a big stretch to get it to sync to a 15kHz input
signal.
Yes, you might be able to modify some components to slow it down, or even
Oh, yes, the entire discussion is about monochrome video. Sorry, should
have mentioned it in the follow up email as well.
On 2021-04-11 9:26 p.m., gregebert wrote:
At least it's just monochrome. NTSC composite video with color is
rather complex, though I must say it is also ingenious in that
Still new to the whole composite video thing---could you clarify what is
the stretch? Do you think the driving electronics might not work at the
lower NTSC frequency? Or is there a mechanical impediment, like the
windings of the CRT's yoke? Thank you!
Jens
On 2021-04-11 7:19 p.m., Adrian
At least it's just monochrome. NTSC composite video with color is rather
complex, though I must say it is also ingenious in that it is
backward-compatible to monochrome and packs so much video information into
a 3.58Mhz bandwidth. Similar for PAL, though higher bandwidth.
On Sunday, April 11,
It sounds a bit of a stretch - 15kHz to 19kHz. You could try running the
monitor without an input signal and adjusting horizontal frequency (if
there is one) to see what range it can manage.
Another possibility is to fix it in software by creating a custom monitor
signal. Some information is at
Thank you! I think it should be possible to modify the horizontal and
vertical deflection circuitry on the board to make it a proper NTSC
frequency, yes?
Jens
On 2021-04-10 10:52 p.m., 5-ht wrote:
Jens,
The horizontal sync requirement of this monitor (52 uS / 19.2Khz) is
somewhat higher
Jens,
The horizontal sync requirement of this monitor (52 uS / 19.2Khz) is
somewhat higher than a standard NTSC signal which is about 63 uS / 15.7 Khz.
Mark
On Saturday, April 10, 2021 at 8:04:15 AM UTC-5 Jens Boos wrote:
> Thank you! I did some more digging and found the service manual for
Sent: 4/10/2021 3:59:19 PM
To: "NeoNixie"
Subject: X-IMail-SPAM-Connection Re: [neonixie-l] OT: How to convert
composite video into TTL?
I built a couple LED TV sets about ten years ago. I had to solve this
problem. I bought a sync separator ch
I built a couple LED TV sets about ten years ago. I had to solve this
problem. I bought a sync separator chip for the first one, and a digitizer
chip for the other.
See the bottom of the page for schematics.
http://www.cathodecorner.com/satanvision/
On Sat, Apr 10, 2021, 6:04 AM jb-electronics
Thank you! I did some more diggin and found the service manual for the
display (Panasonic TR-60S1A, see here:
https://www.opweb.de/english/company/Panasonic/TR-60S1A)
There is is a timing chart (see below). It looks an awful lot alike NTSC
to me, can somebody confirm?
Best wishes
Jens
Thank you! I did some more digging and found the service manual for the
display (Panasonic TR-60S1A, see here:
https://www.opweb.de/english/company/Panasonic/TR-60S1A)
There is is a timing chart (see below). It looks an awful lot alike NTSC
to me, can somebody confirm?
Best wishes
Jens
It's easy enough to extract the sync signals, as you've seen. It may not be
particularly difficult to modify the TTL input to analog, or to create a
TTL level signal if you don't need a grey-scale. On many general-purpose
monitors like that they could often be built for either standard - the
Hi all,
This is a bit of an off-topic question, but I hope there will be
somebody here that can help. I have bought a new-old stock monochrome
CRT for a HP Agilent 8920A, basically this unit here:
https://www.ebay.com/itm/273930914548 .
It looks to me that it is just a rebranded OmniVision
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