5v to 3.3v

Using Arduino General Electronics
#1

Hey, I'm using a pair of nRF24L01 transceivers, here's the datasheet in case you need it.

The modules run on 3.3v and consume 15mA at most.

I have a 9v power source on one circuit, and a 5v source on the other. I'm looking for the simplest way to get to 3.3v. As the modules don't use much current, I'm assuming I can just use a resistor for each, but I have no idea which resistors to use.

#2

One similar to these SMPS would work.

#3

The Arduino Uno has 3.3V out at 50mA...

#4

I'm using an ATtiny84, so I have to include my own regulators

#5

Try one of these:

Datasheet: http://www.taydaelectronics.com/datasheets/A-492.pdf

Its small, cheap and only needs a couple of caps to make it work.

If you need a lower dropout (and more current) try:

Datasheet: https://www.sparkfun.com/datasheets/Components/LD1117V33.pdf

#6

CantSayIHave:
As the modules don't use much current, I'm assuming I can just use a resistor for each, but I have no idea which resistors to use.

Wow! How many things can you get wrong at one time? In one sentence.

If resistors did the job, voltage regulators

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would not have been invented.

And the nRF24L01 transceiver doesn't use much current - unless of course, it is operating. :grinning:

#7