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- CCD video camera DC
March 12, 2006, 6:02 pm
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Re: CCD video camera DC
I don't know anything about these cameras but it appears to me that
the BNC connector carries both power and signal. If so, then you will
need to connect a high frequency choke in series with the supply, as
+14.5VDC o--- choke --+------o BNC DC IN / Video Out
video out o--<---||----|
The choke looks like a high impedance to video signals but acts as a
short circuit for DC. You may need a capacitor in the video circuit to
isolate the DC. This is the kind of arrangement you find in the power
supplies for masthead amplifiers.
The AutoIris connector is an unknown for me. I would have thought that
there would be an external control pin so that the iris could be
automatically adjusted to maintain a certain light level. Perhaps
that's what DC IN (pin 3) refers to??? Maybe the video pin (2) is used
by the external device for sensing the light level???
- Franc Zabkar
Please remove one 'i' from my address when replying by email.
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