if you converted your computer power supply like this for your layout or your
workbench you're gonna want to see this or if you have one of those too so let's
see what this is all about I'm Tom Kvichak and this is Toms Trains and Things
this channel was created to help other modelers who are in need of guidance in
pursuing their dream of building a model railroad and some time ago we talked
about taking one of these things apart and taking all the plugs off here and
dividing all these wires up into the voltages and using it as a power supply
on our model railroad or on our workbench and we also talked about this
one right here which gives you a constant voltage but only one voltage
you can set the current on it also well what can we use it for well that's what
I'm gonna show you in this video right here then right after this if you would
like to see more videos like this on Toms Trains and Things about model
railroading about beginners about electronics about just about anything go
ahead and hit that subscribe button and while you're at it ding that Bell so you
can be notified whenever I have a new video coming out so let's get started
with this thing right here and see what we could do with these power supplies
that we have where we're gonna put it on our model railroad or what we're gonna
do with it on the workbench the first thing you want to take note of before
you do anything is check the data plate on your power supply now your power
supply may be different than mine mine's a 305 watt and it was manufactured for
Dell although all power supplies are made in the same place now this one here
is 5 volt is 22 amps max 12 volt is 18 amps max minus 12 volt is one amp max
3.3 volt is 17 amp max now there's two rails in this one a low voltage rail and
a high voltage rail so the low voltage rails 3.3 volt and 5 volt
and it says do not exceed 150 watts in there and I'll show you how to figure
that out and the 12 volt A and 12 volt B rails not to exceed 264 watts okay so
that's one thing that you have to take into consideration if you're using a lot
of the three volt and the 5 volt ones you can't exceed 150 watts on there and
those two voltages but your power supply may be different so that's why you have
to check the data plate on it that's what you have to take a look at and you
could run many things on your layout and on your workbench now this one here it
doesn't have to be this specific brand this one goes anywhere from 0 to 30
volts at 5 amps now they make them up to 10 amps also but the one that I have is
5 amps and I'll show you what we could use on this one also figuring out the
maximum wattage on your power supply is a piece of cake or should I say a piece
of pie on my example for the Dell we had 150 watts maximum for three and a half
three point three and five volts so with this formula here P equal I times E
which is pi we could transpose that and we want to figure out current so the
current which is I would be equal to P over e so we put 150 over three point
three and that comes out to 45 and a half amps now you're not going to be
using that many amps on there now that is a lot of amps now figuring out for 5
volts is 150 over five which is 30 amps now if you put those two together you
can't exceed the what the 450 watts so somewhere in there the maximum for the 5
volt and the maximum for the 3.3 volt is far below what the maximum is if you
would use it by itself on the 3.3 it said the maximum amperage on there
was 17 amps you're not gonna be using 150 watts on there because 150 watts is
all the way up to forty five and a half amps twice that so don't even worry
about it you've got plenty of power on here now for the 12 volts you have 264
Watts divide that by 12 and that comes out to 22 amps and the maximum on the 12
volt was 18 amps and if you wanted to use the the minus 12 honor that was the
maximum on one amp so you could combine the the want the minus 12 and the plus
12 to get 24 volts now there are some items that you can use 24 volts on but
it's only one am and what I'm gonna tell you right now is these Woodland Scenic's
Just Plug you could run that off of the 24 volts because that is it they want to
sell you a wall wart for $20 which is 300 milliamps at 24 volts DC and that is
plenty of power on that you got one amp that's more than the 300 milliamps that
you need for running this right here that just plugs so that's one thing that
you could use on there another item that you could use if you're using digit ax
that D s 64 the DF 64 is anywhere from 12 to 14 volts so you could use you
could tap in on the 12 volt one for the D S 64 now a lot of the other items for
digit tracks come with a power supply the ps4 Tina and that is 14 volts DC PM
42 BDL 168 PR4 all of those come with a wall wart but if that wall word
ever goes bad boom you could use a 12 volt off of
there now I am going to show you how to use a voltage divider say you want to
use nine volts off of that 12 volts or say off of the 24 volts you want to drop
that down to 16 volts or 15 volts to replace one of the ps4 teens I'm going
to show you how to do a simple voltage-divider and all it requires is
two resistors and I'll bring the diagram right up here and I'll show you how to
calculate that now if you have any other type of DCC equipment most of those come
with the power supply but if you want to use a command station a lot of command
stations don't come with power supplies so this thing right here is a good
candidate for that for up to five amps now they do make like I said they do
make them up to ten amps so you're covered on here this goes up to thirty
volts you could plot you you could Dow in
whatever voltage you want on there you could also doubt in the maximum amperage
that you want to limit this to so this is a good source for those command
stations for your DCC now for all the accessories that you're using like the
tortoise switch machine 12 volts will do it everything circuit ron has runs from
12 to 18 volts except for the Tortoise Switch Machine which is 12 volts now you
could use that power supply here for anything that's circuit Ron now for DCC
concepts the cobalt switch machine that's 9 to 12 volt DC for DCC
specialties everything on that runs off of your track power so you don't have to
worry about anything on there but let's talk about that voltage divider on that
voltage divider right there you have two resistors r1 and r2 and then you tap off
the center and you can also do this with a potentiometer
but anyway r1 and r2 say you have 12 volts over here and you want to bring
the output to 9 volts you want r1 now you could change the value of this R 1
would be 1 K and r2 would be 3 K and that would bring your output
down to nine volts pretty simple and here's the formula for it
piece of cake so if you want to bring your voltage down to another voltage off
of that 12 volt 9 volt you could do it if you want to bring it down to 6 volts
you could do it to 6 volts if you if you're using the 24 volts and you want
to bring it down to 15 volts or 14 volts you could do this also on there where
did we get the term watt W ATT well we got that from James Watt he was an
18th century mechanical engineer he also made improvements to the steam
engine even James Watt who we think of in electrical terms had a lot to do with
the steam engine that we use on the locomotives today every accessory that
you use on your model railroad if it's powered with DC you could use this power
supply here from the computer or you could use this power supply right here
instead of a wall wart if it if you have something that requires a wall or you
could use that power supply on it and you could adjust the voltage on it to
match whatever voltage you need as long as it's DC LEDs can be powered at 3.3
volts at 5 volts at 12 volts there's even some that are 24 volts
like the woodland scene you just plug coming up in some videos later on we're
going to be doing things on an Arduino and right here this is 9 volts on the
USB USB is typically 5 volts and they also have pins on the side for 3.3 volts
and 5 volts right over here now I have one that I bought about four years ago
it was manufactured by make instead of the 18 mega 3:28 chip that's normally in
there it's got an SMD chip in there similar to that and in some future
videos these right here are ATmega3:28 for
the Arduino and I'm going to show you how to make your own Arduino
board keep an eye out for that that's coming up in March because I just got
all the stuff here from Sparkfun that I've been waiting for for a couple of
weeks I got everything in this little red box here that we need to make our
own arduino's for our projects it we're gonna do it with this and we're gonna
make our own one and do it with that so we could store it anywhere we want on
our layout in a smaller package to this now granted you could get them though
Arduino minis and do the same thing but with this it only cost about five
dollars to make an Arduino so and it's more fun to alright keep an eye out for
the Arduino projects coming up in March we got a resistance substitution box so
we could do some projects with the Arduino and other electrical projects on
our railroad so we'll see ya
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