Need help sourcing a power supply: +5VDC >=120A - Vancouver Hack Space

The old Google Groups will be going away soon, but your browser is incompatible with the new version.
Message from discussion Need help sourcing a power supply: +5VDC >=120A
Received-SPF: neutral (google.com: 66.196.40.251 is neither permitted nor denied by best guess record for domain of vhs-general-return-8450-VancouverHackSpace+garchive-21100=googlegroups....@lists.hackspace.ca) client-ip=66.196.40.251;
Mailing-List: contact vhs-general-h...@lists.hackspace.ca; run by ezmlm
Sender: <vhs-gene...@lists.hackspace.ca>
Precedence: bulk
Reply-To: vhs-gene...@lists.hackspace.ca
MIME-Version: 1.0
In-Reply-To: <1352496700.91911.YahooMail...@web121404.mail.ne1.yahoo.com>
References: <1352495335.67388.YahooMail...@web121406.mail.ne1.yahoo.com>
	<1633754964.15542163.1352495968988.JavaMail.root@cds054>
	<1352496479.35033.YahooMail...@web121403.mail.ne1.yahoo.com>
	<1352496700.91911.YahooMail...@web121404.mail.ne1.yahoo.com>
Date: Fri, 9 Nov 2012 13:35:26 -0800
Message-ID: <CAH7yiB=orLh4ZWYds9atieEORe3EdTL3wOU4rg3HW3_UW11...@mail.gmail.com>
Subject: Re: Need help sourcing a power supply: +5VDC >=120A
From: David Carne <davidca...@gmail.com>
To: vhs-gene...@lists.hackspace.ca, 
	Stephen Young <frenchcanadianflyfish...@yahoo.ca>
Content-Type: multipart/alternative; boundary=20cf307d0528e5eba804ce16baab

--20cf307d0528e5eba804ce16baab
Content-Type: text/plain; charset=ISO-8859-1

John,

If they're going to be multiplexed in the standard way [Connect one row to
gnd, drive column as necessary or vice versa, then repeat with next row],
then you only need 40 * 300ma, which is 12A, which is much more realistic
and doesn't require welding-cable thickness power supplies.

--David Carne


On Fri, Nov 9, 2012 at 1:31 PM, Stephen Young <
frenchcanadianflyfish...@yahoo.ca> wrote:

> ORrrrrrrrr.....  Remove all the lamps (screwdriver on the outside, whack
> with a hammer, go to next one, repeat.  Shake the mess out.), mount a
> super-duper bright, 13.8Vdc powered LED on heatsink at the base, and let
> the light shine through the holes...
>
> SDY
>
>   ------------------------------
> *From:* Stephen Young <frenchcanadianflyfish...@yahoo.ca>
> *To:* "vhs-gene...@lists.hackspace.ca" <vhs-gene...@lists.hackspace.ca>
> *Sent:* Friday, November 9, 2012 1:27:59 PM
>
> *Subject:* Re: Need help sourcing a power supply: +5VDC >=120A
>
> Why is it dawning on me that it was never functional, Edsel style (design
> the car first and then try to fit a power source into it ;), the company
> lost a lot of money on that one...).
>
> So what you originally wanted is a DC-DC converter, high amps...  Or a few
> medium amps...  Newark or Digikey, delivered by Tuesday, have you checked
> them out?
>
> I still think that re-LEDing the whole ball of wax (...) is the way to go,
> is it feasible?
>
> SDY
>
>   ------------------------------
> *From:* John Craver <jcra...@shaw.ca>
> *To:* vhs-gene...@lists.hackspace.ca
> *Sent:* Friday, November 9, 2012 1:19:28 PM
> *Subject:* Re: Need help sourcing a power supply: +5VDC >=120A
>
> It's a 2 foot diameter replica of the Science World dome made from 1/8"
> steel plates and chrome plated.  There are 400 holes drilled in it, each
> with one of these lamps.  Apparently it was built int the early 90's (which
> makes it almost as old as me), and there was no controller, no driver, and
> no power supply.  Just the dome with the lamps and wires.
>
> As I mentioned before, there is a 4.2 ohm resistor and a 1N4002 soldered
> in series with each lamp, then covered in heat shrink.
>
> Yes, you are correct, there are 40 lamps connected to each bus, and there
> are 10 buses.
>
> Unfortunately, this project had absolutely no documentation
>
> And to boot, it has to be mounted onto the CEO's car in 10 days, in
> preparation for the Santa Claus parade, so it has to be powered off of a
> car battery.
>
> ----- Original Message -----
> From: "Stephen Young" <frenchcanadianflyfish...@yahoo.ca>
> To: vhs-gene...@lists.hackspace.ca
> Sent: Friday, November 9, 2012 1:08:55 PM
> Subject: Re: Need help sourcing a power supply: +5VDC >=120A
>
>
>
> Another question, what was used to power them "before"? Can't it be fixed?
> Did it ever work?
>
>
> SDY
>
>
>
>
>
>
>
> From: John Craver <jcra...@shaw.ca>
> To: vhs-gene...@lists.hackspace.ca
> Sent: Friday, November 9, 2012 12:47:52 PM
> Subject: Need help sourcing a power supply: +5VDC >=120A
>
> Hi, all.
>
> I have a bit of a strange request. At work, I have a device that I have to
> repair that uses 400 multiplexed itty bitty incandescent lamps (10 rows of
> lights, each with 40 lights). They each use 5V at 300mA when they're on
> (they're actually 1.5V lamps, but they have a 4R2 resistor and 1N4002 diode
> in series with each one to make it compatible with 5V. I know, it's
> inefficient to do it that way, but that's the way they did it, and my
> timeframe is a bit tight to be modifying it now).
>
> Anyone know where in town I can get a power supply that could supply 120A
> at 5V? Alternatively, I can power each of the 10 banks of lights
> individually, and use multiple smaller power supplies.
>
> Any advice with this is appreciated. Frankly, I'm stumped.
>
> Thanks
> -John C.
>
> --
> VanHackspace (VHS) general list: vhs-gene...@lists.hackspace.ca
> http://vancouver.hackspace.ca/wp/mailing-lists/
>
>
>
>
> --
> VanHackspace (VHS) general list: vhs-gene...@lists.hackspace.ca
> http://vancouver.hackspace.ca/wp/mailing-lists/
>
>
>
>
>
>

--20cf307d0528e5eba804ce16baab
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

John,<div><br></div><div>If they&#39;re going to be multiplexed in the stan=
dard way [Connect one row to gnd, drive column as necessary or vice versa, =
then repeat with next row], then you only need 40 * 300ma, which is 12A, wh=
ich is much more realistic and doesn&#39;t require welding-cable thickness =
power supplies.</div>
<div><br></div><div>--David Carne</div><div class=3D"gmail_extra"><br><br><=
div class=3D"gmail_quote">On Fri, Nov 9, 2012 at 1:31 PM, Stephen Young <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:frenchcanadianflyfish...@yahoo.ca" tar=
get=3D"_blank">frenchcanadianflyfish...@yahoo.ca</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div><div style=3D"font-size:10pt;font-famil=
y:verdana,helvetica,sans-serif"><div><span>ORrrrrrrrr.....=A0 Remove all th=
e lamps (screwdriver on the outside, whack with a hammer, go to next one, r=
epeat.=A0 Shake the mess out.), mount a super-duper bright, 13.8Vdc powered=
 LED on heatsink at the base, and let the light shine through the holes...<=
/span></div>
<div style=3D"font-style:normal;font-size:13.3333px;background-color:transp=
arent;font-family:verdana,helvetica,sans-serif"><br><span></span></div><div=
 style=3D"font-style:normal;font-size:13.3333px;background-color:transparen=
t;font-family:verdana,helvetica,sans-serif">
<span>SDY<br></span></div><div><br><blockquote style=3D"border-left:2px sol=
id rgb(16,16,255);margin-left:5px;margin-top:5px;padding-left:5px">  <div s=
tyle=3D"font-family:verdana,helvetica,sans-serif;font-size:10pt"> <div styl=
e=3D"font-family:times new roman,new york,times,serif;font-size:12pt">
 <div dir=3D"ltr"> <font face=3D"Arial"> <hr size=3D"1">  <b><span style=3D=
"font-weight:bold">From:</span></b> Stephen Young &lt;<a href=3D"mailto:fre=
nchcanadianflyfish...@yahoo.ca" target=3D"_blank">frenchcanadianflyfishing@=
yahoo.ca</a>&gt;<br>
 <b><span style=3D"font-weight:bold">To:</span></b> &quot;<a href=3D"mailto=
:vhs-gene...@lists.hackspace.ca" target=3D"_blank">vhs-gene...@lists.hacksp=
ace.ca</a>&quot; &lt;<a href=3D"mailto:vhs-gene...@lists.hackspace.ca" targ=
et=3D"_blank">vhs-gene...@lists.hackspace.ca</a>&gt; <br>
 <b><span style=3D"font-weight:bold">Sent:</span></b> Friday, November 9, 2=
012 1:27:59 PM<div><div class=3D"h5"><br> <b><span style=3D"font-weight:bol=
d">Subject:</span></b> Re: Need help sourcing a power supply: +5VDC &gt;=3D=
120A<br>
 </div></div></font> </div><div><div class=3D"h5"> <br><div><div><div style=
=3D"font-size:10pt;font-family:verdana,helvetica,sans-serif"><div><span>Why=
 is it dawning on me that it was never functional, Edsel style (design the =
car first and then try to fit a power source into it ;), the company lost a=
 lot of money on that one...).</span></div>
<div style=3D"font-style:normal;font-size:13.3333px;background-color:transp=
arent;font-family:verdana,helvetica,sans-serif"><br><span></span></div><div=
 style=3D"font-style:normal;font-size:13.3333px;background-color:transparen=
t;font-family:verdana,helvetica,sans-serif">
<span>So what you originally wanted is a DC-DC converter, high amps...=A0 O=
r a few medium amps...=A0 Newark or Digikey, delivered by Tuesday, have you=
 checked them out?</span></div><div style=3D"font-style:normal;font-size:13=
.3333px;background-color:transparent;font-family:verdana,helvetica,sans-ser=
if">
<br><span></span></div><div style=3D"font-style:normal;font-size:13.3333px;=
background-color:transparent;font-family:verdana,helvetica,sans-serif"><spa=
n>I still think that re-LEDing the whole ball of wax (...) is the way to go=
, is it feasible?</span></div>
<div style=3D"font-style:normal;font-size:13.3333px;background-color:transp=
arent;font-family:verdana,helvetica,sans-serif"><br><span></span></div><div=
 style=3D"font-style:normal;font-size:13.3333px;background-color:transparen=
t;font-family:verdana,helvetica,sans-serif">
<span>SDY<br></span></div><div><br><blockquote style=3D"border-left:2px sol=
id rgb(16,16,255);margin-left:5px;margin-top:5px;padding-left:5px">  <div s=
tyle=3D"font-family:verdana,helvetica,sans-serif;font-size:10pt"> <div styl=
e=3D"font-family:times new roman,new york,times,serif;font-size:12pt">
 <div dir=3D"ltr"> <font face=3D"Arial"> <hr size=3D"1">  <b><span style=3D=
"font-weight:bold">From:</span></b> John Craver &lt;<a href=3D"mailto:jcrav=
e...@shaw.ca" target=3D"_blank">jcra...@shaw.ca</a>&gt;<br> <b><span style=3D=
"font-weight:bold">To:</span></b> <a href=3D"mailto:vhs-gene...@lists.hacks=
pace.ca" target=3D"_blank">vhs-gene...@lists.hackspace.ca</a> <br>
 <b><span style=3D"font-weight:bold">Sent:</span></b> Friday, November 9, 2=
012 1:19:28 PM<br> <b><span style=3D"font-weight:bold">Subject:</span></b>
 Re: Need help sourcing a power supply: +5VDC &gt;=3D120A<br> </font> </div=
> <br>It&#39;s a 2 foot diameter replica of the Science World dome made fro=
m 1/8&quot; steel plates and chrome plated.=A0 There are 400 holes drilled =
in it, each with one of these lamps.=A0 Apparently it was built int the ear=
ly 90&#39;s (which makes it almost as old as me), and there was no controll=
er, no driver, and no power supply.=A0 Just the dome with the lamps and wir=
es.<br>
<br>As I mentioned before, there is a 4.2 ohm resistor and a 1N4002 soldere=
d in series with each lamp, then covered in heat shrink.=A0 <br><br>Yes,
 you are correct, there are 40 lamps connected to each bus, and there are 1=
0 buses.<br><br>Unfortunately, this project had absolutely no documentation=
<br><br>And to boot, it has to be mounted onto the CEO&#39;s car in 10 days=
, in preparation for the Santa Claus parade, so it has to be powered off of=
 a car battery.<br>
<br>----- Original Message -----<br>From: &quot;Stephen Young&quot; &lt;<a =
rel=3D"nofollow" href=3D"mailto:frenchcanadianflyfish...@yahoo.ca" target=
=3D"_blank">frenchcanadianflyfish...@yahoo.ca</a>&gt;<br>To: <a rel=3D"nofo=
llow" href=3D"mailto:vhs-gene...@lists.hackspace.ca" target=3D"_blank">vhs-=
gene...@lists.hackspace.ca</a><br>
Sent: Friday, November 9, 2012 1:08:55 PM<br>Subject: Re: Need help sourcin=
g a power supply: +5VDC &gt;=3D120A<br><br><br><br>Another question, what w=
as used to power them &quot;before&quot;? Can&#39;t it be fixed? Did it eve=
r work? <br>
<br><br>SDY
 <br><br><br><br><br><br><br><br>From: John Craver &lt;<a rel=3D"nofollow" =
href=3D"mailto:jcra...@shaw.ca" target=3D"_blank">jcra...@shaw.ca</a>&gt; <=
br>To: <a rel=3D"nofollow" href=3D"mailto:vhs-gene...@lists.hackspace.ca" t=
arget=3D"_blank">vhs-gene...@lists.hackspace.ca</a> <br>
Sent: Friday, November 9, 2012 12:47:52 PM <br>Subject: Need help sourcing =
a power supply: +5VDC &gt;=3D120A <br><br>Hi, all. <br><br>I have a bit of =
a strange request. At work, I have a device that I have to repair that uses=
 400 multiplexed itty bitty incandescent lamps (10 rows of lights, each wit=
h 40 lights). They each use 5V at 300mA when they&#39;re on (they&#39;re ac=
tually 1.5V lamps, but they have a 4R2 resistor and 1N4002 diode in series =
with each one to make it compatible with 5V. I know, it&#39;s inefficient t=
o do it that way, but that&#39;s the way they did it, and my timeframe is a=
 bit tight to be modifying it now).
 <br><br>Anyone know where in town I can get a power supply that could supp=
ly 120A at 5V? Alternatively, I can power
 each of the 10 banks of lights individually, and use multiple smaller powe=
r supplies. <br><br>Any advice with this is appreciated. Frankly, I&#39;m s=
tumped. <br><br>Thanks <br>-John C. <br><br>-- <br>VanHackspace (VHS) gener=
al list: <a rel=3D"nofollow" href=3D"mailto:vhs-gene...@lists.hackspace.ca"=
 target=3D"_blank">vhs-gene...@lists.hackspace.ca</a> <br>
<a rel=3D"nofollow" href=3D"http://vancouver.hackspace.ca/wp/mailing-lists/=
" target=3D"_blank">http://vancouver.hackspace.ca/wp/mailing-lists/</a> <br=
><br><br><br><br>-- <br>VanHackspace (VHS) general list: <a rel=3D"nofollow=
" href=3D"mailto:vhs-gene...@lists.hackspace.ca" target=3D"_blank">vhs-gene=
r...@lists.hackspace.ca</a><br>
<a rel=3D"nofollow" href=3D"http://vancouver.hackspace.ca/wp/mailing-lists/=
" target=3D"_blank">http://vancouver.hackspace.ca/wp/mailing-lists/</a><br>=
<br><br><br> </div> </div> </blockquote></div> =20
 </div></div></div><br><br> </div></div></div> </div> </blockquote></div>  =
 </div></div></blockquote></div><br></div>

--20cf307d0528e5eba804ce16baab--
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
Account Options
