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2015Cameras (Film/Video/HD) forum

Power supply options and voltage behavior for Alexa cameras

DisputedParticipants disagreed and reached no conclusion. Read the findings as positions, not as an answer.

What the thread found

  • The Alexa camera can operate on both 12V and 24V power inputs through its 2-pin connector.
  • Running the camera at 24V is more efficient than 12V because it reduces amperage draw by approximately half, resulting in less voltage drop through cables and longer battery runtime.
  • When a PRO sled is in 24V mode, the 12V pin still carries 12V power, allowing simultaneous operation of 12V accessories.
  • The camera's RS ports output 24V when the camera is supplied with 12V input, indicating internal voltage regulation or conversion.
  • Multiple power sources can be connected simultaneously to the camera, which will use the higher voltage and hot-swap between them if necessary.
  • The acceptable input voltage range for the camera is 10.5V to 32V, though technically the camera can accept up to 34V with the high end limited to 32V for safety.
  • Third-party accessories powered from the camera's RS ports may not be protected for voltages above certain thresholds, requiring verification before use.

Depends on

  • Some technical details about internal voltage regulation remain unclear and contradictory between sources.
  • One participant mentioned being unable to power an early BOXX version with only 12V from an XCS sled, but this may be model-specific.
  • The question about powering the camera from a LEMO 0B.303 connector on a CineLive box was asked but not answered in the thread.
  • Participants acknowledged uncertainty about some details and recommended double-checking specifications before implementing.
  • It is unclear whether all Alexa models and versions behave identically regarding voltage handling.

Gear in this thread

Zephyrcatalog, CineLivecatalog, MDR

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