Hello! I have a project in progress and to power my 2 electronic boards I use 2 different batteries (because different voltage, one at 24V and the other at 5V). I wanted to know if it was possible to optimize this, using only 1 battery, of 24V for example, and to connect my 2 electronic cards to this battery? (using a converter Buck for the 5V card for example) (or any other type of converter, do you have any idea?). Thank you for your respond!
Hi, @vaialex26
Welcome to the forum.
What boards are they?
What other hardware do you have?
Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.
Thanks.. Tom.. 
Hi Tom, Thanks!
Unfortunatly, I can't show you any schematic or circuit diagram.
The only information I can give you are that :
- The 24V battery supplies a kind of microcontroller and some sensors downstream
- The 5V battery supplies a board like an arduino
And all of these stuff are connected to an other board (with some other little sensors) to communicate with a computer
So, today I have 2 batteries to supply the 2 seperate parts of the circuit (24v on one hand and 5v on the other), and I'd like to know if I can supply all the circuit with only one battery (It can be 24v, or more if It needs more voltage (but how to quantify the voltage needed ?, any suggestion ?)).
And so I could connect in parallel the arduino (with a converter) and the microcontroller+sensors to the 24v battery (or other voltage).
Sorry for not giving you any details on that. I just want to know if the concept of a central battery would work.
Too bad if you can't respond to my questions. Thanks for you reactivity!
In principle you can use a buck converter to reduce 24 volts to 5 volts especially if the 24v and 5v circuits share the same ground.
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In which case the only help I can give you is :-
Good luck with your project
How on earth do you expect an accurate answer with so little information?
Is this homework?
If not then be aware this is an open source forum.
What have you got to fear about letting us know what you have? Especially when you are asking such a beginners question in the first place?
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Yes Grumpy, you're right.
I suspected that it will be not enough information to have an accurate answer, but I can't give you more information, sorry.
It's not a homework and I know this is a open source forum.
Here I give u 2 very simplified schematic, one is the actual (with 2 batteries) and the other one is the one I would like to know if it could work (only one battery).
I take in consideration your comment @6v6gt , thank you!
And if with that you guys can't answer my questions, it's ok, I gave it a shot ... Thank you all for your responses!
Your diagrams don't really help much because, if you are showing power sources, you should show the positive and ground rails.
Just use the +24v and GND to replace the 24 volt battery in your circuit and the +5v and GND to replace the 5 volt power source. Note that this assumes that the circuits, that you are interconnecting, share a common ground.
Add fuses etc. for protection against overloads/failures.
Ok great, thank you very much for your responses and your time @6v6gt ! 
Thank you all for your involvement!
Have a nice day and enjoy your electronic projets!
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