Ubiquiti makes or used to make a device that did that. The indoor version that looked like an elongated coupler, and an outdoor version that was a plug on a pigtail with a jack on the other end. They are about $20 for either one.

Part number INS-8023AF

They are converting from 48v 802.3af to 12V passive PoE on the spare pairs. Are you looking at the same application, or something else?


On 11/30/2015 5:42 PM, Chuck McCown wrote:
I found a chinese source for $11.  1 inch by 2 inches by .75 inch.
I am making a converter to power 12 volt devices off of 48 vdc poe.
*From:* George Skorup <mailto:[email protected]>
*Sent:* Monday, November 30, 2015 3:31 PM
*To:* [email protected] <mailto:[email protected]>
*Subject:* Re: [AFMUG] DC-DC Converter
What's huge? A Mean Well RSD is going to be rather large. There's also the Traco DIN rail mount (TCL series, and that will be over $50/ea), but that is also pretty large. What application?

On 11/30/2015 4:19 PM, Chuck McCown wrote:
It is huge. Looking for something that will be around for some time. Things like this I fear are surplus/overruns/obsolete EOL products.
*From:* Mathew Howard <mailto:[email protected]>
*Sent:* Monday, November 30, 2015 2:44 PM
*To:* af <mailto:[email protected]>
*Subject:* Re: [AFMUG] DC-DC Converter
how about $2.29?

http://www.ebay.com/itm/DC-DC-HRD-Converter-24v-36v-48v-Step-Down-To-12v-3A-Power-Module-Portable-/201239343894?hash=item2edaccb316:m:m9vd1B-jJ6zZr8sE6SAWNYQ


On Mon, Nov 30, 2015 at 2:50 PM, Chuck McCown <[email protected]> wrote:

    Need 48 in, 12 out.
    *From:* SmarterBroadband <mailto:[email protected]>
    *Sent:* Monday, November 30, 2015 1:48 PM
    *To:* [email protected] <mailto:[email protected]>
    *Subject:* Re: [AFMUG] DC-DC Converter

    How about $11.

    We have used these to power radios off batteries for installers.
    They are adjustable - we set them 48v out on 16.2v battery packs.

    
http://www.amazon.com/DROK-Converter-Transformer-Regulator-Inverter/dp/B00BZR9PBW

    Adam

    *From:*Af [mailto:[email protected]] *On Behalf Of *Chuck McCown
    *Sent:* Monday, November 30, 2015 12:38 PM
    *To:* [email protected]
    *Subject:* [AFMUG] DC-DC Converter

    Looking for the smallest cheapest 12 volt to 48 volt unit that
    will do 20 watts.

    Digi-Key has some but they are not cheap.  Looking for something
    in the $20 range.



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