Multiple capacitors
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I am using a circuit that has a voltage regulator (7805) and the maxim
7819 display controller. Circuits I've seen for each include a 10uF and
a .1uF capacitor between the power and the ground. Should I include two
of each of these capactitors (one for each) in my system or are they
duplicates and I need only one of each?
Thanks
Bob roan
7819 display controller. Circuits I've seen for each include a 10uF and
a .1uF capacitor between the power and the ground. Should I include two
of each of these capactitors (one for each) in my system or are they
duplicates and I need only one of each?
Thanks
Bob roan
Comments
bob@t... writes:
> I am using a circuit that has a voltage regulator (7805) and the maxim
> 7819 display controller. Circuits I've seen for each include a 10uF and
> a .1uF capacitor between the power and the ground. Should I include two
> of each of these capactitors (one for each) in my system or are they
> duplicates and I need only one of each?
>
>
Use both and locate as close to the chips as possible.
Sid
[noparse][[/noparse]Non-text portions of this message have been removed]
support its voltage regulation duties.
The .1 uF cap near the 7805 is to supply current
for high-frequency (short duration) switching
spikes.
The 7819 controls LOTS of LED's, with an internal
scan. Normally, with a large TTL compatible
device (RAMS, 8255's, 74HCT595's) I'd put a
.1 uF across +5 and GND for small switching
transients. The 7819 does lots of current,
so the 10 uF makes sense near it. Again, you'll
want the .1 uF also, to filter high-frequency.
So yes, you want both, at both places.
While this 'looks like' duplicates,
what you're trying to do is reduce the amount
of noise and voltage-bounce near your high
current chips.
--- In basicstamps@yahoogroups.com, "Bob Roan" <bob@t...> wrote:
>
> I am using a circuit that has a voltage regulator (7805) and the
maxim
> 7819 display controller. Circuits I've seen for each include a
10uF and
> a .1uF capacitor between the power and the ground. Should I
include two
> of each of these capactitors (one for each) in my system or are they
> duplicates and I need only one of each?
>
> Thanks
>
> Bob roan