Interfacing to Sony CCUs

We found three issues to deal with when interfacing Sony CCUs to Clearcom-type systems. Please review the circuit description and schematic diagram for the Clearcom-type system.

We use these cameras and CCUs almost exclusively in a production unit where all the control-room personnel (director, AD, TD, shader, tape operator, etc.) are using Clearcom-clone intercom stations. Because of this, we decided to modify the cameras to boost the audio level to the earphones in the camera op's headset, and to attenuate the mic signal. We made a very small (postage stamp size) circuit board with an op-amp booster and a volume control to knock down the mic level.

This has worked out quite well for us, but it might not be practical for everyone, and especially not for rental equipment(!)  Actually, it wouldn't be hard to package the earphone boost and microphone attenuator into a very small external package which could be used with any camera, but it is not the elegant, no-modification solution we would have preferred.

So what it comes down to is an interface unit which connects between the Clearcom bus and the CCU bus (simply the transformer and capacitor); and another unit on each camera which boosts the earphone level and attenuates the mic level. ComClone Interfacing to Sony CCUs

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2002 Richard Crowley
Updated: 03 May 2003
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