Easiest way to power 8.4v servo?

Using Arduino Motors, Mechanics, Power and CNC
1

I'm looking at 60kg servos like this: https://www.amazon.com/ANNIMOS-Digital-Voltage-Stainless-Waterproof/dp/B07KTSCN4J/ref=sr_1_4?keywords=60kg+servo&qid=1577361481&sr=8-4

It says it works best on 8.4v or 7.4v

Currently I'm using a power supply like this: Amazon.com

It takes 12v dc and turns it into 5v or 3.3v.

Is there a similar module which takes 12v dc and turns it into ~8v?

I'm looking for something simple because I'm a noob. I read about relays and transistors but they both looked very complicated

Thanks

1 Like
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That servo is going to need A LOT of current so, as it says in your link, it would be best to power it from a 2S 7.4V Lipo battery. Lipos are good at providing short term high currents when needed.

If you must run from a 12V source then you can get DC-DC converters that have adjustable outputs and can be set to around 8V. But you will need one that can supply at least 5A. Maybe something like Amazon.com but the specifications for those things aren't very reliable.

Steve

3

i use an adjustable step down regulator on my bench with an old 16V wall wart. I adjust to to my needs, sometime starting at much less voltage in case of a wiring or programming error

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4

Thanks for the pointers everyone. After reading your comments and looking at related products I decided to get this setup:

buck converter - Amazon.com

wall power supply - Amazon.com

(I don't need a battery as my project is not mobile)

5

presumably the current adjustment is a limit. you may get no output or less voltage than expected if it's not set higher than what you need

6

tubbyman:
wall power supply - https://www.amazon.com/110V-220V-Converter-Lighting-Transformer-Flexible/dp/B073QTNF9F/ref=sr_1_10?keywords=5a+dc+power&qid=1577364761&sr=8-10

(I don't need a battery as my project is not mobile)

For same price tag I bought a 12V/240W transformer, that can deliver 12V at 20A (and not only 5A) if needed:
https://forum.arduino.cc/index.php?topic=636736.msg4321843#msg4321843

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HermannSW:
For same price tag I bought a 12V/240W transformer, that can deliver 12V at 20A (and not only 5A) if needed:
outrunner motor RPM / KV? - #21 by HermannSW - Motors, Mechanics, Power and CNC - Arduino Forum

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No you DID not! You bought a power supply!!!!

Paul

8

Transformers are two (or more) coils of wire on a single core. They transform voltage and current for AC only.

Mains power supplies used to be based on a large mains-frequency transformer and rectifier/smoothing capacitor.

Now they are switch-mode, using a switching IC and including a smaller high-frequency transformer and control circuitry.

They are refered to as linear or switch-mode power supplies, or simply mains power supplies.

A transformer as such can be used to convert 240V mains to 110V mains or vice versa, or to generate 24Vac from the mains.