I'm a beginner in electronics, and in the process of completing a homemade power supply would love to get some advice.
The power supply itself is fairly straightforward - I'm using a laptop power supply with an output of about 20V and it powers my circuit which consists of:
- 2 fixed at 3.3V and 5.0V
- 2 adjustable with voltage and current limit
- and another 5.0V to power an arduino nano
- 4 INA219 breakouts to measure each channel voltage and current
- an arduino nano to collect the data
- and an LCD to display voltages, currents, current limits, etc.
It all works, however, when I attach my homemade (arduino based) oscilloscope to the outputs, I'm noticing some ripple on the 3.3V and 5V channels, adding a 100uF cap improved it but didn't get rid of it, so I upped it to 1000uF which got the job done, (or at least within +-0.03V which is the margin of error of my crappy home-made oscilloscope).
So, the question is - is there any reason not to put a 1000uF cap at the outputs of these channels?
I don't have a schematic because the circuit was simple enough, so I didn't make one before implementing it.
To simplify my question further, imagine just a DC power source and a step-down switching voltage regulator, would there be any reason not to put a 1000uF capacitor on the output of the regulator?
EDIT: Added line breaks, I couldn't figure out how to do it last night. Sorry for the mess.