I'm trying to find a small 1000µf capacitor for my Arduino shield. The shield is a digital synthesizer that is powered by the Arduino's 5v regulated power.
After discovering that the 5v supply from the Arduino is incredibly noisy when using it to generate sound whilst plugged into my computers USB port, I popped on a 1000µf cap and all was good.
Now I'm trying to find a more compact solution, as the massive 1000µf cap hanging off the shield is just too huge, plus it gets in the way of the header connections and other components on my board – making it hard to stack the shield with other Arduino shields.
I've found some nice and compact 1000µf caps, they're niobium oxide based and so they have a pretty low voltage rating.
My question is this: Can I use more than one niobium oxide capacitor in order to increase the maximum voltage handling?
The capacitors I'm interested in have a maximum voltage rating of 4v, I would like to double that, the voltage they will nominally have to handle will be 5v, however I'd like to have a fair bit of head room.