Electronics > Beginners

One battery or two

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Ohm_My:
I have this designed in my head but I need to know if it will work. I'm wanting to power two devices with different input voltages from a single 3S LiPo battery. I sketched out the design online and would like to know if it will work as is or does the circuit require two batteries?

All comments are welcome and appreciated.

Thanks.

ledtester:
It'll work if it's ok that the devices share a common ground.

What are the devices?


Ohm_My:
Device 1 is a ublox F9P GPS evaluation board (https://www.u-blox.com/en/product/c099-f9p-application-board).
Device 2 is a wireless 3dr 915MHz telemetry radio.

ledtester:
You don't need the 9V step-down to power the ublox board - you can connect the 3S Lipo battery directly to the DC input jack -- have a look at page 13 of the User Guide:

https://www.u-blox.com/sites/default/files/C099-F9P-AppBoard-Mbed-OS3-FW_UserGuide_%28UBX-18063024%29.pdf

Also, the ublox board certainly has voltage regulators on it, and it's Arduino shield compatible, so it should have pins that will deliver +5V. In that case you will be able to power the 3dr radio board directly from the ublox board if it really consumes at most 100 mA.

In short, you don't either of the step-down converters.

Ohm_My:
Wonderful. I hadn't thought about tapping off of the 5V supply for the Arduino shield but that would certainly work. I was just being cautious to use a voltage regulator for the GPS board even though it does accept a 6-17V DC input.

So it sounds as if I only need to power the GPS board straight from the LiPo and tap the 5V pin on the Arduino shield for the 3dr telemetry radio. It sure makes it easier when a second pair of eyes looks it over and offers up suggestions.  :)

Thanks for taking the time to look this over and commenting.

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