Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Solid State CRT Televisions

Notices

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 10-25-2025, 10:07 PM
Videotechie Videotechie is offline
VideoKarma Member
 
Join Date: Jun 2022
Posts: 51
J halphen thanks

Thanks for info on lm1881 very useful. Did anyone use this to display a video signal on an o-scope??
Reply With Quote
  #2  
Old 10-26-2025, 05:27 AM
jhalphen's Avatar
jhalphen jhalphen is offline
VideoKarma Member
 
Join Date: Feb 2007
Location: Paris, France
Posts: 592
Hi to all,
Hi Videotechie,

What you call "Z axis" is actually the analogue video modulation applied to the oscilloscope or X/Y display's Cathode or Grid to produce a picture.
In a standard 1 Volt peak-to-peak video signal, the brightness intensity (Black to White) is the 0.7V (700 mV) analogue signal contained between the blanking level (0.3V) and peak White (1V). The complete signal with Sync is 1V Peak to Peak.

Labguys World web site shows two projects he built to use a X/Y display as a 525 line/60 Hz TV monitor (standard System M/NTSC scan rates). Both circuits use the LM1881 as a Sync separator and give good insight into what is necessary to achieve the desired goal.
Schematics, photos & extensive explanations in both projects.

1st project :
http://www.labguysworld.com/Project_Tiny_TV.htm

2nd project :
http://www.labguysworld.com/Project_Tiny_TV_2.htm

Best Regards
jhalphen
Paris/France

Last edited by jhalphen; 10-26-2025 at 05:47 AM.
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 06:16 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2026, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.