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Jun 30, 2004, 09:57 AM
Registered User

Help a Newbie Girl Understand OPTO ESC & S-BEC? Pics Attached

Hello All,

Aircraft World is recommending an OPTO ESC and an S-BEC for my:

1. 104" Flying Wing
2. 12-cell Sub-C pack
3. AXI 2820-12
4. 4 Standard Full-Sized Servos for Flight Control, plus 1 for Steerable Nose Gear, plus 1 for triggering Camera Shutter.

Why go OPTO and S-BEC?


How do OPTO ESC's and S-BEC's connect into the Radio/Power System?

Attached are the specs of my Flying Wing and a pic of Ming with a similar Electric setup on the same Flying Wing.

Thank you for the benefit of your experience to this very INexperienced, but very enthusiastic Newbie,

Julie ;o)
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Jun 30, 2004, 11:39 AM
Registered User
mmormota's Avatar
The reasson of the S-BEC: there are 12 cells, the battery voltage is higher then average, about 15V. The usual built-en BEC in a controller is a simple analog stabilisator. The BEC makes 5V from the 15V battery. The more the battery voltage above 5V, the more the heating power on the stabilisator. There are 4 servos, a high Amps load in combination with high battery voltage is too much for a usual analog stabilizator.

Opto means that the receiver input is opticallu isolated, but in the rc scene it means that "no BEC in the motor controller" too.

The S-BEC is a switching mode power supply, it is not dissipating so much power, but converts the battery voltage to the 5 or 6V for the servos in amuch more efficient way.
Jun 30, 2004, 11:45 AM
Registered User
mmormota's Avatar
Using the S-BEC, take a look to the datasheet:

Here is the connection diagram (if there is no battery connector on your receiver, you should connect it to a not used channel too, if there is no free channel, use a Y cable... ) :
Last edited by mmormota; Jun 30, 2004 at 11:49 AM.
Jul 01, 2004, 09:03 AM
Registered User

Thank You So Much . . .

. . . for the benefit of your experience and knowledge. I now have a very good understanding of WHY I need an OPTO ESC and S-BEC as well as how they work and how they connect into they system.

Thanks again!

Julie ;o)

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