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.
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