bigscreen wrote:Great job so far, okay,......
I m not sure with the speed 1500/min, if this is correct, and if it is correct that the smal drum has to spin slower 4 times, but even if this is not what I tought, it don't matters with what I m trying to explane in my drawing now, but I tought that this is a correct way to have a good solide connection with the two drums,....
The signal from the cd could be used to get the sync holding the big drum in syncronisation, and the big drum could make the signal for the small drum wich I believe will spin in sync with the synced speed of the big one.
Just a tought of how I would try it out ofcourse.......
Hi Patrick Thanks once again for your input you have made a lot more working mechanical tv's than i ever have so i do listen don't worry.
I am not sure about the 1500 speed as well i would say its a bit slower since i have 2 more slit lines .
holtzman has told me its 12 rotations to one rotation of the 6 line small drum ...he has 12 lines large and 6 small gives the correct aspect ratio as well ..mines 14 ,6 and due to its smaller size gives a more 4.3 look i'd say.
So yes the small drum has to run much slower...using 2 drums or discs gives a nice picture size i think theres nothing like it till you get to a mirror screw for size but i like the design better as back lighting looks better than front lighting.
Looking at your block diagram i will look into it good to do things correctly ,but running the thing on manual i have found the small drum due to the stepper motor idea again from holtzman gives me no trouble at all free running its no harder getting a picture on this with manual control than on a nipkow one disc.
Yes on the large drum controlling the small this is how holtzmans cdm works...but on hes he is using a mechanical light braker to drive 4 mosfets which is a replacement for the stepper motor electronic ic's ,i am using the electronics to drive the stepper and trying one light braker which will drive a monostable, the timer my clock for the system i can at the moment switch between it and my free running Astable clock when i get around to it i will try either just using the monostable triggerd by the light braker or using it the monstable to sync in the 555 timer Astable multivibrator one way should work...worst case it works in manual control and i can still get a picture .
I have been wondering about 60 line i am wondering if its twice the speed with out playing around with the line slit numbers my drum motor could do it is from a 80s video disc player ...vibration at very high speeds could be my only problem mmmm