I'm working on an arduino project. The arduino have a 5V output up to 500mA and a 3.3V output up to 50mA. The problem is i have to power several circuits under 3.3V who consume between 8mA and 20mA each. 8 circuit maximum, so 160mA max. So I can use the builtin output to power two of them but will need to drop the voltage of the 5V output to 3.3V.
I've found 3 options :
- Series resistors, but with 160mA I will need some 2 Watts resistor and I don't have some actually.
- Diodes in series, seems ok for me, got a bunch of 1N4007 but as the load can change, the voltage drop will change too, and let's say I have only one device connected, I will have much more than the 3.3V...
- Voltage regulator, but I can't find some for 5->3.3, or really expensive (around 10€, 15$)
Any ideas ?