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Explanation of BEC and capacitor please :)

Explanation of BEC and capacitor please :)

Old 04-30-2011, 03:39 AM
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Originally Posted by 1101 View Post
Ah finally the old cap myth debunked.

I never could see how a power cap could store any worthwhile energy in a RC circuit. The math doesnt really add up.
Its just in parallel with the batt, both will drop voltage equally, at the same time.
In fact if the batt has lower internal resistance( I assume it has), the power cap wont do anything (except filter spikes, noise etc)
Cap can be usefull power stores in AC power supplies, not DC.

Just From my experience...with spektrum receivers
The receiver cap has nothing to do with voltage drops, it smooths out spikes & noise - as seen when I scoped it up.
My esc has a 3A BEC, yet rx was still glitching/resetting/restarting with some nasty standard servos.No way the servo draw 3A.
Was just all the noise the servo was putting into the RX causing the issues, nothing to do with voltage drops. Spektrum RX will work below 4v.
Some receiver works perfectly with power cap if using a Ko Pro or Fubaba servo
yes esc caps are for filtering/spikes
but from watching the telemetry on the spektrum with savox servos,the voltage drops dramatically,add a cap and voltage stays constant.
caps dont add power but they help keep voltage constant from spikes.
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