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Asked — Edited

Servo External Power Pack

Does anyone have a diagram of a servo set up with a second power source?(Eg. Heavy duty servo)


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Could you show me using this?

Got a little confused on the other post.

Feel free to modify this directly to show.
United Kingdom
Basically, red & black from the servo just connect to a 6V supply. White connects to the EZB.

Easiest way of doing it is to snip a servo extension's red and black wires on the male end only (the end that attaches to the EZB) and connect these to the 6V power source by whatever means, stripboard like my example, barrier strip, crimps, etc.
Take the red and black from the servo attaching to the red and black of the battery. now I'll take the white of the servo and attach it to a signal pin of a digital signal port. Tie all your blacks together.
I have used this on all of my bots and it works fantastic! And so simple to do.
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Yes. Make sure your external power pack is no greater than 6V at any time. Personally I use a 6V voltage regulator to ensure a constant 6V from my 7.4v 2S LiPo pack (which is 8.4v when fully charged).

Also, even if the servo wire is long enough to reach both the EZB and Power pack I'd still always use a servo extension for any modification to the wiring, it means you can change things in the future.
Rich, great tips.

Can I bug you to show us noobs how to connect a 6v regulator?
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You can't bug me, I'll happily try to explain anything...

Basically, the simplest way is to buy a regulator such as this one. It comes with JST connectors on both ends, one male and the other female. I don't recall which way round it goes but will check when I get home.

This sits between the supply (up to about 25v I think) and the load (the servos).

It reduces the voltage down to 6v and can supply up to 5A. Enough for a few servos. Run more than one from the battery and split the circuits (of that's unclear say so and I'll knock up a quick schematic to explain it).

It's that easy.

You could make your own voltage regulator but I wouldn't bother.

Thanks rich. Knowledgable and super cool. Really appreciate it.
United Kingdom
Decided to do a quick schematic for using more than one regulator here.

Or if it's legible

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M ake shore you ground the EZB from power supply

Second item you using a digital servo or standard servo,standard takes 5 volts to 6 volts
and digital is 5 volts to 7.4 volts,there is some standards that take 7.4 but i would check the specs

ANY power supply conveter can work,best is whats called LDO regulator and get up to more then 7 amps,they are better then DC-DC converter.

Main reason is Low Drop VOLTAGE,witch meens you battery current will last a alot longer then and DC-DC convert .can get is as low as 6.05 volts using a 6 volts or higher input

i guess easy way to explain is take a 7.4 battery and you want 6 volts out all dc-dc converter cut off at 6.25 volts input ,but on LDO can go lower then 6.05 volts so if you do the math you save a lot of current

THATS any company who makes battery equipment type of tester only use LDO

I DESIGN dc-dc converter besides using LDO ,I AM ELECTRONIC engineer at test equipment making factory that qequipment for A/C AND ELECTRIC FIELD