Multiple Voltage Sources?
- From: "FyberOptic" <fyberoptic@xxxxxxxxx>
- Date: 10 Jul 2006 10:58:57 -0700
Hiya folks, I've been trying to understand more about circuits and
electricity in general, and I've been left confused about a few things.
My brain has been trying to think of it all in a strictly procedural
way as from a programmer's standpoint, but obviously electricity isn't
quite so linear/predictable. So for the moment, I'll stick to a
particular subject for my question askery, otherwise this would end up
being a huge post.
Basically, I'm curious what happens when two (or more) seperate voltage
sources are available in a circuit, and how they interact. Say you
have a chip which runs off of 5v, an IC of some sort, and you want to
trigger its inputs using TTL signals (5v) which originated from a
totally seperate source (a parallel port, for example). I know this is
possible, but I'm curious about the underlying results.
Now, it's kind of hard to put into words everything I'm trying to ask,
so I'll do my best. Does the 5v from the signaling TTL line (the
parallel port) travel through the IC to the IC's ground? I'm thinking
it would, in which case, how do amps come into play? I'd assume you'd
then be pushing the TTL line's amps into the IC's power circuit. And
if so, would this increase the overall amperature in the IC's circuit
everytime that TTL line is active? My question is valid in the reverse
as well I guess, if I were to be pushing data from the IC into the
parallel port.
Perhaps another thing to ask is simpler. From what I understand, if
you took two 5v ac adapters, and hooked both positives and negatives
together (putting them in parallel basically), you'd still end up with
a 5v source, but with more amps, correct? Though I also think this
would put more strain on the weaker supply (since no two would be 100%
identical), similar to what I've read about batteries in parallel,
right? In any case, isn't this concept similar to the above, with the
IC? Would you be putting strain on one of the two circuits by mixing
them?
A third curiosity could also involve ac adapters. If you took two of
the same voltage, could you power a circuit by using the positive line
from one, and the negative line from another? I guess technically
you're breaking the "loop" in this case, though, despite them both
being connected to the same AC line.
Also, what would happen if you took a 5v and 12v adapter, and ran a
circuit off of the 5v, but connected a component's ground to that of
the 12v circuit? Or vice-versa? I guess this kind of generalizes
everything I've already asked, but mixing voltages just confuses me
completely.
I think this is all I have to ask about this particular subject for the
time being, though I'll surely think of something I forgot after I
submit it. lol. Anyhoo, thanks in advance!
.
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