piclist 2002\07\06\004836a >
Thread: .1uf between Vcc and gnd ???
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face picon face BY : Jinx email (remove spam text)



> Does it make any sense to have a 0.1uf cap between Vcc and
> Gnd if my circuit is gonna be powered by a battery ?

As the battery runs down its impedance goes up, so any
components that draw high instantaneous currents such
as IR LEDs, relays, perhaps some switches, even other
ICs that the PIC controls the quiescent current of, may
cause a negative-going spike or even a slight temporary
droop of Vcc. 0.1uF may help some problems, but other
cases may require a larger cap, if you can stand the leakage
of an electrolytic. There could be instances of some unwanted
frequency being imposed or inducted onto Vcc and a small
filter cap may help there if there's a problem with that noise
affecting the circuit

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