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Old 05-09-2002, 07:40 AM   #1
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Default Servo Voltage Qn (Ko Propo 2123)

Hi,

I was thinking about purchasing the 2123 servo... yeah, the one with the ridiculous stats... at 7.2V.

I'm aware that most Speed controls can provide a max of 6V...

1. How does the 2123 perform under 6V (as compared with 2143 for example)?

2. How do you link up the servo directly to the battery pack to provide 7.2V? Anyone does this?

regards,

jwwu
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Old 05-09-2002, 08:00 AM   #2
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jwwu,

Most speed controls have an extra wire coming from the case, that wire is the 7.2 volt tap for the 7.2 volt FET servos like the KO 2123.

The 2123 will also have an extra wire coming from its case. All you'll need to do is connect the extra wire from the servo to the extra wire from the speed control and you've got your 7.2 volt feeding the FETS in the servo. There will be a small choke (looks like a resistor) that goes between the two wires where they connect, it comes packaged with the servo.

If you have a speed control that doesn't have the extra wire, you can tap off the positive wire from the battery to the speed control, that's also 7.2 volts (assuming you run a 6 cell battery).

For what its worth, I use the KO 2143, almost identical to the 2123 but runs at 6 volts and doesn't require the extra wiring. I've used both, and I cna't say the difference was worth the extra hassle.

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Old 05-09-2002, 08:06 AM   #3
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Thanks Trips... I have a Keyence Extreme V 2002. And yes, it does have a thin wire sticking out... I had no idea that it was for a 7.2 Servo!
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Old 05-09-2002, 09:23 AM   #4
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Trips, what does the choke or resistor that goes in between the wires look like? Is this necessary? I currently run a KO FET servo and I don't have a choke on, should I?
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Old 05-09-2002, 09:38 AM   #5
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Yes you should, it will stop voltage spikes that could cause interference.
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Old 05-09-2002, 09:38 AM   #6
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According to the instructions, the choke is to prevent glitching. If your setup is working well without it I guess you don't need it there.

The choke looks like a chubby resistor, it should have come with the servo. Sorry, but I don't know the value.

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Old 05-09-2002, 12:08 PM   #7
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you will not need that resistor if you are running Ko brand ESC.

Ko2123 is an amazing servo. the best I ever had.
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Old 05-09-2002, 01:37 PM   #8
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It's an RF choke/inductor. Value 4.7mH i think
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Old 05-10-2002, 07:54 AM   #9
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hi,...
jwwu :
i have the keyence zero xtreme yr2002 edition esc also and i'm running my ta04r with a KO 2143 servo...no problem encounter so far and i'm veri pleased with it's performance,the keyence zero xtreme esc matched with a KO 2143 servo...

in my opinion,if the 2143 works great,then jus use it,having more addition electronic parts installed on the car will oni increase the risk of electromagnetic interference somewhere...because all metal parts can actually act as an pick-up antena for the electromagnetic signals...

well,...jus a suggestion...a personal view as well...
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