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Old 05-07-2007, 06:25 PM   #1
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7.2V Servo Direct From Battery

Having tried using a motor fan running directly from the battery I noticed it stopped under full power, presumably due to the current draw.

What's to stop a 7.2V servo from having the same problem when wired through a choke to the battery +?

Will it not have the same problem as it only connects too the positive?

In ask as I use a 7.2V servo and a new Nosram brushless speedo doesn't have FET wire

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Old 05-07-2007, 06:34 PM   #2
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The fans stop because most of the fans sold from RC companies are rated for 5V. Running off of 5 or 6V BEC circuit from ESC or reciever they work fine. These fans typically are brushless DC and the controller burns up. To run direct from battery you need to get a 12V rated DC fan, the only problem with that is it will run slower than rated or won't run at all.

As for the servo, check the manufacturers documents for input support for 7.2V from battery. Some servo's come with extra wire to connect direct from battery. Each manufacturer may have a limit to voltage seen on that connection.
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Old 05-08-2007, 06:29 AM   #3
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Quote:
Originally Posted by tel
The fans stop because most of the fans sold from RC companies are rated for 5V. Running off of 5 or 6V BEC circuit from ESC or reciever they work fine. These fans typically are brushless DC and the controller burns up. To run direct from battery you need to get a 12V rated DC fan, the only problem with that is it will run slower than rated or won't run at all.

As for the servo, check the manufacturers documents for input support for 7.2V from battery. Some servo's come with extra wire to connect direct from battery. Each manufacturer may have a limit to voltage seen on that connection.
Cheers, I believe the servo is a KO PDS-2123 (the sticker was missing when I got it but it does have metal gears)

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Old 05-08-2007, 01:57 PM   #4
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Hi
Just to let you know I have been running a 2123 in the fashion you describe for the last 3 years and it is stil going strong
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