Posted: Sat Nov 24, 2012 5:54 am
Steve, I have started building the new cct and had another
thought (fatal that!)
To demonstrate to myself and others how a NBTV picture changes as the framing is moved slowly one could add this ganged switch to the cct.
This would switch in a larger C and put a larger R pot in series with the existing one, in the timing RCcct of the 2-3ms 4538 as I show, giving a new range of timing from 3ms to 80ms.
This would enable the frame pulse to be shifted anywhere in the picture at the flick of a switch and a turn of the new pot, and hence roll the picture until giddy
I do not know what the highest/lowest values for the R and C in the 4538
timing can be , although I have seen as low as 10k for the R and up to 30n for the C.
Do you know what the limiting values are please?
thought (fatal that!)
To demonstrate to myself and others how a NBTV picture changes as the framing is moved slowly one could add this ganged switch to the cct.
This would switch in a larger C and put a larger R pot in series with the existing one, in the timing RCcct of the 2-3ms 4538 as I show, giving a new range of timing from 3ms to 80ms.
This would enable the frame pulse to be shifted anywhere in the picture at the flick of a switch and a turn of the new pot, and hence roll the picture until giddy
I do not know what the highest/lowest values for the R and C in the 4538
timing can be , although I have seen as low as 10k for the R and up to 30n for the C.
Do you know what the limiting values are please?