Micro MinimOSD stops overlaying in flight: solution

Both MinimOSD and Micro MinimOSD suffers from irritating technical problem. In some setups, they stops overlaying data during hard maneuvers or even right after arming. Problem is very simple: chip MAX7456 is extremely sensitive in terms of supply voltage quality. Working motors and/or servos, can introduce enough power supply noise to occasionally force MAX7456 to reset.

Luckily, solution is simple: separate LC power filter or big enough capacitor connected in parallel to 5V pads of MinimOSD.

Almost any big enough electrolytic capacitor will do (> 100uF, the bigger the better) but best results can be archived with low ESR > 500uF capacitor.

In my case symptoms were not very strong, usually only very fast flips caused MAX7456 to reset, but I’ve decided to go big: 1000uF low ESR capacitor.

Low ESR 1000uF Capacitor

Micro MinimOSD has 5V pads on a side and they are the best place to attach capacitor.

Micro MinimOSD

As you can see below, capacitor is bigger than MinimOSD itself and I had to think a little how to place it inside my Reptile X4R 220 frame.

Micro MinimOSD with capacitor attached

Results are great: no more MinimOSD problems. OSD stays on all the time, no matter how hard I use the stics.

2 thoughts on “Micro MinimOSD stops overlaying in flight: solution

  1. Hi, I´ve got the same problem but mine is minimosd V1.1. Where do you consider to solder this capacitor in v1.1?
    Thanks in advance

    1. In my airplane minimOSD (not micro) and capacitors on both 5V and 12V supply lines. Just soldered directly to pins on the bottom side of the board. And extra LC filter on 12V line

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