I'm mocking up a basic 555 timer circuit so as to understand the fundamentals of the IC. The schematic I'm using suggests placing a capacitor across the power terminals in order to "smooth out" the voltage. Is this to protect the IC from voltage spikes? But if the power source is VDC doesn't that mean the current is stable? Or is this a precautionary measure taken on all circuits that incorporate IC(s)? Thank you.