Black lines on throttle even with filtered power

[Chippercheese]

So here';s my setup;

12v board cam, 12v step-up (from 5v), Skylark TinyOSD, ImmersionRC 5.8 transmitter with filtered power adapter.

I';ve flown with a 5-15v camera (with no step-up) just fine (only changed because crappy CMOS couldn';t handle sunlight). However, now I';ve added the step-up I am seeing thick (well, varying/shifting/wibbly) black lines and such when I throttle up.

It looks like the OSD text is also affected - if it was purely a camera noise issue, I';d assume that the OSD overlay would be fine over a black-lined video feed?

Any experts have ideas on how I can mitigate this?

Perhaps power the camera straight off the (filtered) 3s flight lipo rather than the ImmersionRC 5v-out/step-up?

[james]

Stick a nice big electrolytic cap across the output of the step-up supply? Sounds like it might be just dipping below 12v briefly on the output or something. Ferrite ring on the output to help mitigate any RF wouldn';t hurt, either.

[Chippercheese]

Stick a nice big electrolytic cap across the output of the step-up supply? Sounds like it might be just dipping below 12v briefly on the output or something. Ferrite ring on the output to help mitigate any RF wouldn';t hurt, either.

Cheers for the suggestion!

So the cap would go between GND and VOUT? I';ve got spare ferrites, will add one in the morning. Would any harm come from wrapping the whole 3-pin camera lead around the ferrite (including GND and VID)?

[marcysiek]

HI.

I think that step up voltage regulator is affected by ESC.
So in order to reduce all noise from esc you should add one copacitor before voltage regulator and one after.
Of course ferrite ring after voltage regulator could help.

But there is one question: do you have filter only on ImmersionRC 5.8 transmitter?
If so make connection as in picture.

[james]

Cheers for the suggestion!

So the cap would go between GND and VOUT? I';ve got spare ferrites, will add one in the morning. Would any harm come from wrapping the whole 3-pin camera lead around the ferrite (including GND and VID)?

Yeah, between VOUT and GND, and make sure you pay attention to the cap';s polarity, look for the white stripe down the side which indicates negative on an electrolytic. I';d be aiming for 2200uF or similar, capacity-wise. Ferrites on everything won';t hurt!