View Single Post
  #12  
Old 04-08-2021, 08:40 PM
Opcom's Avatar
Opcom Opcom is offline
VideoKarma Member
 
Join Date: Jun 2012
Location: Dallas, Texas
Posts: 78
Electromagnetic type what i was discussing would need freq response to 60KHz for the point-drawing scopeclock of the slowed-down (in software) version of about 8 completed drawings per second
point-drawing scopeclock:
https://www.hackster.io/mircemk/extr...h-esp32-789a08


Of late there is a scopeclock using lissajous figures. These are made by drawing circles and lines (vectors). Those signals come from oscillators, cosine generators, ramps, etc. So the processor in this kind of scopeclock controls those analog signal generators and gates their outputs on and off at the proper times to make the figures. You can tell the difference due to its beautifully rounded numbers. I don't know its drawing speed but that one could be more compatible with the electromagnetic type because it draws its figures like the 'asteroids' type display did. That display is slower IIRC. The vector-drawing scopeclock circuit should be much better for electromagnetic type CRTs.
vector-drawing scope clock image:
https://www.retrothing.com/2006/06/the_oscilliscop.html

As for vector monitors with electrostatic displays, they are high speed like XY scopes (0.5-5MHz) and would display any scopeclock easily. Smaller CRT faces though. Except the h/p 1300 kin:
http://www.decadecounter.com/vta/art....php?item=1137

It's worth saying that there are open files for making both types of scope clocks and you can tell which one you are looking at be seeing the schematic.. My aim is to get up to the 'big' display sizes. I've had to put the project on hold. so many tubes, so little time.
__________________
Timeless Information for Retro-Tech Hobbyists and Hardware Hackers

No Kowtow

Last edited by Opcom; 04-08-2021 at 10:54 PM.
Reply With Quote