4 ms·
You can have perfectly smooth supply voltage by using eg. alkaline batteries and still see noise on the power rails each time a digital IC switches a lot of out
by rzzzt 4y ago
You can have perfectly smooth supply voltage by using eg. alkaline batteries and still see noise on the power rails each time a digital IC switches a lot of outputs at once. The same caps can also act as reservoirs that work against these bounces.
- systems_glitch 4y agoSorry, it was probably unclear that I meant the source of HF noise is the circuit, not the power supply. You are correct, you need them even with battery supplies.