[MLB-WIRELESS] OT product question

[Shaun Lee Clarke]

If the load is just ELV devices such as 12V or so access points, another 
option would be to switch the DC side of the adapter powering them.

This removes a large amount of cost, complexity, and also solves any 
safety issues with switching 240V.

If you went down this path, a cheap option would be the following:

http://www.jaycar.com.au/productView.asp?ID=KV3595&CATID=&keywords=ip+relay&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

These devices to the job well if you only want to access it occasionally 
  to forcefully reboot the AP (through the web interface), but I have 
not had much success with the SDK for more advanced functions (like 
integrating it into custom control software).

Another note with these devices, is that they have 2 NO and 2 NC relays, 
but provided the device isn't powered off, you could still use them to 
cut or restore power to the device by setting the NO relays to be 'Off' 
and turn them 'On' when you want the AP off.

And lastly, for some reason, Jaycar doesn't bundle a 5VDC adapter with 
these units, but they do for the very similar IP Sensor board, so make 
sure you get one of those... I made that assumption and was quite 
annoyed when I couldn't even power the unit on.

If you want to give these units a trial, I've got one that I'm not using 
yet that I would be happy to loan for a while.

  *Shaun Lee Clarke*
*Mobile:* 0433 559 020

*Alternate Mobile:* 0400 211 386

*Strathmore Secondary College*
Computer Technician
clarke.shaun.l at edumail.vic.gov.au
http://www.strathmore.vic.edu.au
(03) 9379-7999

*Victorian Space Science Education Centre*
Computer Technician
shaun.clarke at vssec.vic.edu.au
http://www.vssec.vic.edu.au
(03) 9379-3456



Peter Buncle wrote:
> It's only for a specific controlled application.
> 
> (ie repowering a group of ap's with a total load no greater than 200w)
> 
> And yes a fuse with a 5a rating would be a good idea if outside access
> is possible.
> 
> Cheers
> 
> Peter
> 
>  
> 
> -----Original Message-----
> From: Rowan 2006 [mailto:rowan2006 at sensation.net.au] 
> Sent: Wednesday, 27 December 2006 10:22 PM
> To: melbwireless at wireless.org.au
> Subject: Re: [MLB-WIRELESS] OT product question
> 
> On Wed, 27 Dec 2006, Peter Buncle wrote:
> 
>> I just passed the 5v line thru a board soldered to a plug on the 
>> parallel port which uses a bc548 to buffer & switch a radio parts 2$ 
>> 5v relay rated at 240v 5A
> 
> Call me cautious but if it's a powerboard shouldn't the relay contacts
> be rated in excess of 10A at 240V? What happens if someone unknowingly
> plugs a heater or other high current device into it?
> 
> Cheers.
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