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What voltage battery do I need ?
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Hextejas:
This is always not clear to me so here I am again.
The device that I am building has 2 sub-devices.
1 needs 3.3v and the other needs 6.0v
So, do I merely sum them together = 9.3v, add in a bit of overhead, and look around for a 10v LIPO ?
Or can I use a pair of DC-DC buck converters, and use them to bring a 7.3v LIPO down to the required voltages ?

Thanks
TheHolyHorse:
If they are just low power devices some LDOs will probably be good enough and much simpler. If you have a 6V source you could also just input 6V to the 6V device and add a regulator to the 3v3.
Brumby:

--- Quote from: Hextejas on September 16, 2019, 07:37:15 am ---So, do I merely sum them together = 9.3v

--- End quote ---

No.  This is absolutely wrong thinking - unless you have a really curious circuit topology.

The only sort of "adding" you do in this sort of situation is the current draw of each "sub-device".

This is a more appropriate approach:

--- Quote from: TheHolyHorse on September 16, 2019, 08:27:56 am ---If they are just low power devices some LDOs will probably be good enough and much simpler. If you have a 6V source you could also just input 6V to the 6V device and add a regulator to the 3v3.

--- End quote ---
Hextejas:

--- Quote from: TheHolyHorse on September 16, 2019, 08:27:56 am ---If they are just low power devices some LDOs will probably be good enough and much simpler. If you have a 6V source you could also just input 6V to the 6V device and add a regulator to the 3v3.

--- End quote ---
Thank you and what do you mean by add a regulator to the 3.3v ?
Brumby:
He means use a voltage regulator that can take a 6V input voltage and deliver 3.3V
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