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

[Jay Milk]

I don't think you want a latching relay, unless you know how to build
the support circuit -- a latching relay has two coils and requires a
short pulse of power on either coil to change state.  The advantage is
that it doesn't need any power to hold state, but of course the circuit
isn't straightforward anymore.

I used:
http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=
RLY-625&type=store

On mine and hooked it up to an internal 5V supply of the * box.  When
the box is off, one of my cordless phones gets the line for 911; when
the box is on, the cordless is an extension on *, and the PSTN line goes
into an X100P.

> -----Original Message-----
> From: Rajeev Sharma [mailto:rajeev at hoojamomma.com] 
> Sent: Sunday, October 10, 2004 9:21 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Vonage, PSTN, 911, and hardware question
> 
> 
> OK, first of all, thanks for all the great help everybody. 
> It's nice to see that * has such a nice 
> community!
> 
> 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=50
> 0&item=RLY-87&type=store