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Old Apr 08, 2005, 06:44 PM
hul
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Switzerland
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separate BEC for retract servo?

I'm using 3s LiPo but don't want to run the retract servo on the SBEC.
Thinking of making a simple BEC out of a 7805 voltage regulator for just the retract servo.
This should not get hot for the occasional use the retracts see, may have to use a small heatsink. If the servo stalls the regulator should protect itself (overcurrent or overtemperature) and not cause a problem for the rest of the system.

What do you think?

Thanks, Hans
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Old Apr 08, 2005, 07:51 PM
York Electronics
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Dallas Tx USA
Joined Apr 1999
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Quote:
Originally Posted by hul
I'm using 3s LiPo but don't want to run the retract servo on the SBEC.
Thinking of making a simple BEC out of a 7805 voltage regulator for just the retract servo.
This should not get hot for the occasional use the retracts see, may have to use a small heatsink. If the servo stalls the regulator should protect itself (overcurrent or overtemperature) and not cause a problem for the rest of the system.

What do you think?

Thanks, Hans
Sounds good to me.

It should save the BEC from excessive loads.

Don't forget to filter the 7805's output with a cap. (.1uf is big enough to stop internally generated oscillations). The 7805 can draw allot of idle current if it oscillates.

Gary
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Old Apr 09, 2005, 02:29 AM
hul
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Thanks, Gary, didn't know about the oscillations.

Hans
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