24vdc to 12vdc for remote deployment

Guest
Hi,
My first post so excuse me if I sound a bit basic-I have a 12vdc comms
device that I want to put in a remote cabinet.The cabinet has
24vdc.The device will draw 750mA to 1000mA at most-the specs say 9
watts power for the device.
Space is a preminium so I'm looking for 2 things
1) how to get from 24v to 12v
2) how small can be it, either in unit or PCB form, as to not vastly
increase the footprint of the original device-which is currently 10cm
by 13cm.I've been doing a bit of Googling and it looks like I need a
7812 stabaliser-is this correct and what else do I need for the
"complete" unit?


Thanks


Stew
 
stew.dunn@gmail.com wrote:
Hi,
My first post so excuse me if I sound a bit basic-I have a 12vdc comms
device that I want to put in a remote cabinet.The cabinet has
24vdc.The device will draw 750mA to 1000mA at most-the specs say 9
watts power for the device.
Space is a preminium so I'm looking for 2 things
1) how to get from 24v to 12v
2) how small can be it, either in unit or PCB form, as to not vastly
increase the footprint of the original device-which is currently 10cm
by 13cm.I've been doing a bit of Googling and it looks like I need a
7812 stabaliser-is this correct and what else do I need for the
"complete" unit?

Thanks

Stew
Click to expand...
They are a bit pricey, but this would do it:
http://rocky.digikey.com/WebLib/Power%20One%20Web%20Data/LES%20Series%20-%2015%20Watt.pdf

They are available from Digikey for about $70.

--
John Popelish
 
cabsandy wrote:
Guys,
Thanks for the reply-can you offer advice on the below

http://sunpower-uk.com/retail/product/260/small/YTo0OntzOjc6ImxldmVsaWQiO3M6MzoiNTQ3IjtzOjU6Inh0eXBlIjtzOjU6IkRDL0RDIjtzOjg6InhvdXRwdXRzIjtzOjY6IlNpbmdsZSI7czo2OiJ4d2F0dHMiO3M6NjoiNVctMjBXIjt9
or
http://sunpower-uk.com/retail/datafile/260/260.pdf

It seems to have the spec I'm looking for but is it the right choice? I
would be looking to take it apart for the comms device

Thanks

Stewart
Click to expand...
I assume a car regulator uses 12 volts (or a bit more) on its input
side, so it wouldn't work for a 24 volt input. I can't see the data
sheet without a user name and password.

--
John Popelish
 
In article <1106525297.284730.221690@f14g2000cwb.googlegroups.com>,
stew.dunn@gmail.com says...
Hi,
My first post so excuse me if I sound a bit basic-I have a 12vdc comms
device that I want to put in a remote cabinet.The cabinet has
24vdc.The device will draw 750mA to 1000mA at most-the specs say 9
watts power for the device.
Space is a preminium so I'm looking for 2 things
1) how to get from 24v to 12v
2) how small can be it, either in unit or PCB form, as to not vastly
increase the footprint of the original device-which is currently 10cm
by 13cm.I've been doing a bit of Googling and it looks like I need a
7812 stabaliser-is this correct and what else do I need for the
"complete" unit?


Thanks


Stew

http://www.koolflightsystems.com/ultimatebec.htm
Click to expand...

They do a 12VDC version of it, but you have to ask for it.

Jim
 
John,
Sorry-I forgot you had to register for this site.On the packaging is
says 12-24vdc input with the option of a 3-12vdc output (in 1.5v
steps).

Stewart
 
On 23 Jan 2005 16:08:17 -0800, stew.dunn@gmail.com wrote:

Hi,
My first post so excuse me if I sound a bit basic-I have a 12vdc comms
device that I want to put in a remote cabinet.The cabinet has
24vdc.The device will draw 750mA to 1000mA at most-the specs say 9
watts power for the device.
Space is a preminium so I'm looking for 2 things
1) how to get from 24v to 12v
2) how small can be it, either in unit or PCB form, as to not vastly
increase the footprint of the original device-which is currently 10cm
by 13cm.I've been doing a bit of Googling and it looks like I need a
7812 stabaliser-is this correct and what else do I need for the
"complete" unit?
Click to expand...
For that power, you should be looking for a DC-DC converter (switching
power supply), rather than a linear voltage regulator like the 7812.

For example, see
http://www.cdpowerelectronics.com/products/productline.asp?ID=73



--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
Guys,
Thanks for the reply-can you offer advice on the below

http://sunpower-uk.com/retail/product/260/small/YTo0OntzOjc6ImxldmVsaWQiO3M6MzoiNTQ3IjtzOjU6Inh0eXBlIjtzOjU6IkRDL0RDIjtzOjg6InhvdXRwdXRzIjtzOjY6IlNpbmdsZSI7czo2OiJ4d2F0dHMiO3M6NjoiNVctMjBXIjt9
or
http://sunpower-uk.com/retail/datafile/260/260.pdf

It seems to have the spec I'm looking for but is it the right choice? I
would be looking to take it apart for the comms device

Thanks

Stewart
 
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