SparkFun Forums

[Drpepper50]

I have bread boarded two Nano modules both have their own NRF24L0 radio. Both boards work perfectly when attached to a computer USB/power port.
Both talk back and forth sending and receiving data. Works great.
However if I pull out the USB/power cable from one board and supply 9 volts to Vin .... it won't transmit or receive anymore. I plug the USB/power/communications cable back in and everything is back to normal. I've even used a 120Vac to 5Vdc adapter with a USB output connector and same thing. Won't Transmit/or receive.

Any ideas?

[leon_heller]

Peak transmitter current is probably more than a 9V battery can supply.

[Drpepper50]

Sometimes we just have to type our problems down for someone else to see.
Then the light bulb goes on and things change.
I used a TL2675 voltage regulator to supply more current to the NRF24L01. It was getting hot and shutting down. I don't know why. So I changed it to a fixed regulator LT1086 type and all is very well. I wanted to make sure I had enough current when the NRF24L01 went to MAX power out.
I hope this helps someone else.