5v to 3.3v

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.

One similar to these SMPS would work.

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

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

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

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

would not have been invented.

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