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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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