Hi,
How can I find out that my Arduino UNO will be able to run a circuit(power wise).
I have 2, 16x4 MUXs, an OP-AMP in my circuit (in general). I am controlling my MUXs through arduino and reading analog data via OP-AMP. How can I know they will work with arduino power supply or not?
thanks.
maleee:
Hi,
How can I find out that my Arduino UNO will be able to run a circuit(power wise).
I have 2, 16x4 MUXs, an OP-AMP in my circuit (in general). I am controlling my MUXs through arduino and reading analog data via OP-AMP. How can I know they will work with arduino power supply or not?thanks.
Data sheets for the components should indicate current draw.
Ports on the Arduino can deliver max 20-30 mA or so.
Logic circuits will typically get their power from 5V and GND lines, with output pins used to control them, so the per-pin limits may be irrelevant, whereas there will be a limit to how much current the 5V can deliver and the GND can sink. I believe this to be in the vicinity of 2-500 mA, depending on your power supply.
Mux'es should draw miniscule amounts of current by themselves. OpAmp's I know very little about. They're on my to-learn list. 
Hi,
some information already have been given in the previous answer.
The total power consumption of an Arduino must not exceed 200mA. That sums up Arduino itself plus what it delivers to external devices through its I/O pins.
However you can feed external devices directly via Arduino's +5V / GND.
OpAmps come in a big variety of technologies from bipolar transistor based to FET based and some more types. You have to look at the data sheets to see what they will consume and add it to your calculation.
As I don't know how you will feed your Arduino (USB cable or via the external power plug and what voltage this external power has) pls have a look at the following very comprehensive informations on this site, especially look at "The regulator's limits". Here you will get the required information which can be applied to your planned or given "power situation".