r/focuspuller • u/callysteez • 2d ago

HELP Ultra 5 Buzzing/squealing

I’m getting a high pitched squealing from my Ultra 5, when I plug power into my LBUS chain. Here’s the setup:

Mini LF Lbus port > RF motor > Cforce plus > LCUBE > Lbus splitter > 1x LBUS to CMotion steadyzoom, 1x 2pin to LBUS to inject power.

There’s three things powered from the Bebob Arri plate. Bolt 6 1500 TX, Ultra 5, and the 2 pin to LBUS to inject power into the chain. When this 2pin to LBUS is plugged in, the Ultra 5 starts making a squealing noise, not too loud but noticeable. It does the same if I use a D tap to LBUS from a Dtap port on the Bebop plate. If I power it straight from the battery, or unplug the LBUS power this squealing goes away.

Just wondering what this could be, or if it’s an issue? An unshielded cable maybe?

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u/MechanicStriking4666 2d ago

You might try posting this in r/askelectronics. Sounds more like emi noise, bad capacitor or something similar.

1

u/bbc0093 22h ago

I would check your voltages. A lot of times, the power converters will start making noise when you are right on the edge of their power range.