"Peter" Wrote
> These irises will stick if overdriven. Knocking it lightly will release
> it if stuck. The drive polarity is important. Connecting it straight to
> 5V should cause no damage (26mA through the 190 Ohm coil). A single 1.5V
> battery is a safer thing to try to determine the polarity. Attach it
> first one way then the other and see which opens the lens a little.
> Mark this wire (only feed current to the 190 Ohm coil, ignore the 540
> Ohm feedback coil for now).

I found it, but when I apply 5V (25mA) to it, it fully opens really fast.

> Then make a constant current generator with
> a LM317L and a potentiometer for 30mA f.s. and connect it into the
> circuit (observe the polarity you found before with the 1.5V battery).
> You will need a 9V battery to drive the LM317+iris coil assembly. You
> should be able to set the iris with the potentiometer. Afair you have to
> use a 10kOhm pot in series with 1 KOhm fixed resistor to set a LM317L
> between 3 and 30mA.

And how do I use the feedback from control wires?
I'll try your suggestion tonight (if Radioshack has LM317's) or whenever I 
get the part from mouser.

Thanks a bunch!

Padu 

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