24vdc to 12vdc for remote deployment

Jan 24, 2005 6 Replies

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stew.dunn 21 years ago

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

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Peter Bennett 21 years ago

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

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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

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John Popelish 21 years ago

They are a bit pricey, but this would do it:

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They are available from Digikey for about $70.

John Popelish

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cabsandy 21 years ago

Guys, Thanks for the reply-can you offer advice on the below

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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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John Popelish 21 years ago

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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

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cabsandy 21 years ago

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

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James Beck 21 years ago

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

Jim

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