[Asterisk-Users] Vonage, PSTN, 911, and hardware question

[Rajeev Sharma]

Thanks Henry, that was exactly what I was looking for. Good thing you told me that, because I didn't 
know about the VAC part. I was looking for a DC part for some reason. I'll probably try that once I 
have my server.

Henry Devito wrote:
> I have this fail over setup on my * server at home. I bought a $5 case fan
> that plugged into a power socket on my power supply and just cut the fan
> off.  I then connected this to a 12VDC DPDT relay and it worked fine.  I
> used this relay
> http://www.radioshack.com/product.asp?cookie%5Ftest=1&catalog_name=CTLG&cate
> gory_name=CTLG_010_008_005_000&product_id=275-218
> 
> It was $8.39
> 
> This relay has contacts that can handle 10A 120 VAC.  You want a relay that
> can handle up to at least 105 VAC.  Ring voltage on a POTS line is anywhere
> from 90-105VAC.
> 
>  
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rajeev Sharma
> Sent: Sunday, October 10, 2004 10:09 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Vonage, PSTN, 911, and hardware question
> 
> Yeah, thanks, I was thinking of doing something similar to that. Actually, I
> was gonna spice a cable 
> in my computer's power supply and use that. Why? Because if it's on a UPS,
> then the switch will 
> throw at the same time as the computer looses off. I dunno, I might not even
> use a UPS, just a surge 
> protector, but I'll see. Thanks for the idea.
> 
> Greg Hill wrote:
> 
>>On Sun, 10 Oct 2004, Rajeev Sharma wrote:
>>
>>
>>
>>>Anyway, that double-pole-double-throw relay looks like just the right
> 
> thing. If I'm understanding
> 
>>>right, the relay design that Henry Devito sent me is the exact same thing
> 
> as the Viking PF-6A. So,
> 
>>>has anyone had experience with these things? Are they easy to build? (This
> 
> is a home project, so
> 
>>>things don't have to be professional.) Any tips? Right now I'm thinking of
> 
> trying to build something
> 
>>>out of this $1.25 12VDC relay (I believe Henry said it had to be 12V):
>>>http://www.allelectronics.com/cgi-bin/category.cgi?category=500&item=RLY-8
> 
> 7&type=store
> 
>>
>>I can't find any datasheet for that part anywhere.. Anyway, any DPDT relay
>>would work. You'll need a power source suitable for the coil's rating
>>(voltage) on the relay. It's probably better, actually, if you dig around
>>in your junk computer parts for an orphan wall-wart power adapter. When
>>you find one, see what its output voltage is (find one with a DC output).
>>Then get a DPDT relay with a coil voltage to match. Wire the wall-wart
>>directly to the coil terminals and plug it in. (before doing so, maybe
>>wire on the phone connectors as well)
>>
>>Greg
>>
>>
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> 
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