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Old Oct 08, 2014, 12:27 PM
Registered User
Oman
Joined Aug 2014
90 Posts
Question
What is the different?

Guys please help me to know the different between the :
ESC and opto ESC
BEC and UBEC
???
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Old Oct 08, 2014, 01:29 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,607 Posts
ESC - Electronic Speed Controller (may or may not have BEC).

BEC - Battery Elimination Circuit (often just the basic 'linear' voltage regulator, can be limited to max 3s input, can be low current and limited to the number of servos, can get hot dropping the 3s - 11.1v down to 5v).

UBEC or SBEC - Universal or Switching BEC, same thing different names ( can have a higher voltage input generally 3s and above, higher current capability for more servos, shouldn't get so hot)

Opto ESC - Optical isolation between certain circuitry, may or may not include BEC, ( quite often no BEC included, opto, increases signal noise rejection, less chance of interfering with the receiver).

You can buy a separate BEC, U/SBEC of a higher current rating to use with more than 4 servos, retracts etc.
You shouldn't run an ESC with BEC and a separate U/SBEC together, unless electrically isolated.

Hope that sort of covers the basics.
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Old Oct 08, 2014, 01:41 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
13,607 Posts
Just to add, you could have an ESC without BEC, and use a 4.8v Nimh battery pack to power the receiver and servos etc. Though it will work out heavier.

A 4.8v Nimh pack, (receiver pack as used by the IC engine fliers), is useful to have to power the Rx and servos during setting up, just unplug the ESC from the Rx throttle channel while setting up servos, retracts etc. Much safer than having the main flight pack plugged in.
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Old Oct 08, 2014, 02:16 PM
Registered User
Oman
Joined Aug 2014
90 Posts
Quote:
Originally Posted by eflightray View Post
Just to add, you could have an ESC without BEC, and use a 4.8v Nimh battery pack to power the receiver and servos etc. Though it will work out heavier.

A 4.8v Nimh pack, (receiver pack as used by the IC engine fliers), is useful to have to power the Rx and servos during setting up, just unplug the ESC from the Rx throttle channel while setting up servos, retracts etc. Much safer than having the main flight pack plugged in.
Thank you very much
You posted more than enough
Honestly i thought the different only the efficiency each one has
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Old Oct 08, 2014, 03:16 PM
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Letchworth, Great Britain (UK)
Joined Jul 2004
11,853 Posts
Just one thing to add to eflightray's posts: A true opto ESC will never have a built-in BEC, because that would bypass the optical isolation and defeat the whole object, which is to stop interference from getting from motor and ESC to the receiver. Some manufacturers these days use the word 'opto' to signify that their ESC doesn't have a built-in BEC, even though they have no opto-isolation.

If you're using 2.4GHz radio, there's probably no need to get hung up over opto or non-opto because interference doesn't seem to be an issue with this type of radio -- that's my experience anyway.
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