Re: Need to supply power to 8 sensors. What is the best way?

On Oct 5, 10:29 am, Chatarras <ignacio.gar...@xxxxxxxxx> wrote:
On Oct 5, 11:12 am, Tim Wescott <t...@xxxxxxxxxxxxxxxx> wrote:



On Mon, 05 Oct 2009 10:06:30 -0700, Chatarras wrote:
On Oct 5, 10:53 am, Tim Wescott <t...@xxxxxxxxxxxxxxxx> wrote:
On Mon, 05 Oct 2009 09:45:48 -0700, Chatarras wrote:
Using either CR30-DN or CR30-15A0. According to the data*** (Click
on "CR Series - Catalogue":
http://www.autonics.com/products/products_detail.php?

catecode=01/01/03&db_uid=10)

the current consumptiion is "Max.15 mA for the digital sensor
(CR30-DN and a ----- or blank for the analog sensor. )

First I don't understand why there is a blank for the analog sensor,
does this mean it doesn't matter since it will take whatever it needs
from the AC outlet? Then, I suppose for the DC sensor, which needs 15
mA max, I could use a supply with multiple DC power outputs, (eight I
need) at 24V that would supply these 15 mA for each sensor. What
then, can I use? ( I assume I could use eight 24V ac adapters? but
then its to many of them). Please if you can guide me, this is my
first time supplying anything with power other than in the lab, If
you know about <b> a "multiple DC output power supply" I could use or
where to get it </b>. Or what is the best solution? I'm pretty sure
this is a very simple thing to do, please let me know if this
reasoning is correct, or even an article about this would be great.

One big 24V supply, with all the sensors connected in parallel, should
do just fine. The sensors will take what they need; the promise in the
data *** is that they won't take _more_ than 15mA.

I can't download anything from the site so I just see the page you see.
I suspect that the "AC" sensor is _just_ the sensor without any signal
conditioning electronics. It's there so that _you_ can build the
signal conditioning electronics, and as such the power consumption will
depend on how you excite the thing. If you can't even figure out how
to plug more than one DC-powered unit into a power supply, you don't
want to touch this task.

--www.wescottdesign.com

the page is
http://www.autonics.com/products/products_detail.php?

catecode=01/01/03&db_uid=10

Yes, and I can't get to a data *** from there, as I said.

The question is about a recomendation of a "big 24V power supply" that
will supply the 8 sensors, with 8 connectors. I guess a normal 24V
adapter I could buy anywhere could do the task but I would need to split
the cable.. into 8.

That's right, if the adapter can supply 8 x 15mA.

This is really, really basic stuff -- you need to find some basic
electronics text that starts with an explanation of how to light a bulb
with a battery and goes on from there.

I sincerely hope that your training isn't in electronics -- if it is you
got short changed. Did you never take a class in electronics for non-
electronic engineering majors? If not, if you have the time, and if you
are close to a school that offers it -- take the class.

--www.wescottdesign.com

Thanks for the answer, I appreciate it. This is really basic stuff,
but I've never seen it. I haven't seen a physical 24V power supply
with multiple outputs, that I can buy. I've seen a power adapter, that
outputs 24V I'm searching the Internet, maybe Siemens has one. There
is nothing wrong with my reasoning, simple as it may be, and from the
beggining I said I was looking for a "multiple output power supply".
I've bought electronics about twice, from sparkfun electronics and
maybe one time from Digikey. I can get a 24V power supply, which I
think most of them are 300 mA, so it will work, but then I need to
split the cable, and create connectors for all of them. Thought
something more nice was to be found.

It the difference between buying a single cable or a surge protector
with 8 outlets. Its not a neccesity, but makes things easier. That's
all, I don't even know how to call it, "multiple output dc power
supply with 8 outputs". And well this is my first time supplying 8
sensors with a single power supply. Maybe I need to be more confident
in asking questions, like when asking a girl out.

What is the difference between powering 8 sensors or 8 transistors in
a circuit board? Are you going to build 8 power supplies for a 8
transistors amplifier? How about 16, 32 or 64 transistors?
.

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