I wanted to control speed of my four coreless DC motors using Arduino Nano. Then I realised my 3.7V 380mAh 25C and 720mAh (110mAh on picture is just to hold my battery's place) 25C LiPo batteries won't meet the voltage requirement of a Nano. Then I came up with the idea of using Pro Mini instead of Nano; however I couldn't find a 3.3V pin on Pro Mini to feed NRF24. On Nano, I was using a 3.3V pin and 10uF capacitors between Vin and Gnd legs of NRF24.
So my question is: can I feed NRF24 directly from Vcc pin? Or as an alternative what would happen if I fed NRF24 directly from battery and reduce 3.7V to 3.3V via another TIP122 transistor?
Note: I am using 4 of TIP122 transistors whose gate legs are connected to Pro Mini's 5, 6, 9 and 10 pwm pins (I forgot to add base-resistors). Do you also think it is a reliable way of controlling the motors' speed?