Folks,
I'm lost here, I have a CCTV video lens that has a mechanized iris. The lens I'm using is the DC type (not the one that uses the video signal). It has 4 wires: Control (-), Control (+), Drive (+) and Drive (-).
The lens manual says that maximum voltage is 6V while 0.5V closes the iris and 4V opens the iris. I'm attaching a schematic cut from the lens manual if that helps.
My question is: how can I control that iris by myself? Yesterday I tryed plugging 5V to drive+ and GND to drive- and nothing happened (I added a current limiting resistor in series just in case).
Anyone have a clue on how to control this lens? If I have a 5V psu, just a pot is enough to control it?
Thanks
Padu
I'm lost here, I have a CCTV video lens that has a mechanized iris. The lens I'm using is the DC type (not the one that uses the video signal). It has 4 wires: Control (-), Control (+), Drive (+) and Drive (-).
The lens manual says that maximum voltage is 6V while 0.5V closes the iris and 4V opens the iris. I'm attaching a schematic cut from the lens manual if that helps.
My question is: how can I control that iris by myself? Yesterday I tryed plugging 5V to drive+ and GND to drive- and nothing happened (I added a current limiting resistor in series just in case).
Anyone have a clue on how to control this lens? If I have a 5V psu, just a pot is enough to control it?
Thanks
Padu