AncientBrit wrote:Hi Harry,
Please find attached some further pix.
The head amp is built on stripboard and housed in the space where the original electronics were housed so it's fully screened.
Also v3 of the cct showing where I had to use screened cable for interconnection.
Cheers,
Graham
AncientBrit wrote:Hi Harry,
re the star in the centre of the lens the zoom lens that formed part of the colour camera I took apart to make my NBTV saticon had a form of auto-iris.
With power off the iris was pulled closed by means of a small spring.
The iris was mechanically connected to a solenoid and when power was appled to this solenoid the iris fully opened.
Looking in the handbook I bought it appeared that the solenoid was fed with some form of PWM signal so its effective power could be modulated thereby opening or closing the iris a measured amount.
In my camera I applied the full voltage so on power up it fully opens the iris, so I have to drive the camera on Target volts alone.
[/quote]Could the star be an iris which is fully closed so it cuts off most light??
Are you getting light through the lens??
AncientBrit wrote:Hi Harry,
Not sure why you are having problems syncing a monitor.
Are you not blanking the signal and adding syncs as per my original circuit?
Cheers,
Graham
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