Asked — Edited
Hey Jeremie, can you tell me what size cap you were using to smooth out the power supply DJ was using to power inMoov with?
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It was two 1Farad 2.5V aerogel caps in series placed on the 3.3V line. This makes a 0.5F 5V rated cap.
P.S. I got beer and pizza when I got home... so it wasn't too bad.... LOL
To sustain the input voltage, like you said, a very large cap would be needed. When using servos there is usually many voltage/current spikes on the input side which are hard to filter and sustain while the regulated 3.3V is slightly buffered from it due to it's low voltage input requirements.
I wouldn't recommend using large caps on the input voltage, they will likely be quite expensive for higher rated voltages and there's no guarantee that they can do the job.
I have found some on eBay for $10 for 3... 1 Farad 2.5V...