Re: Silent Phones

[Richard Malcolm-Smith <rich@xxxxxxx>]

That will only work on 3 wire phones, which are getting rarer and rarer
these days.

To kill the ring signal propper, put a bridge rectifier inline with the
phone - AC terminals to the line and the DC terminals to the phone.

This will rectify the AC ring into DC. It has worked on 2 phones I have
done it on, Voltage applied to the phone is no higher then with a normal
ring, as the AC is in addition to the 45volts DC on the line (I think) -
in any case - the electronics in the phone are usually connected via 4
diodes to the line in a bridge configuration.

Of cource, try it on a phone with warentee left first :)

Obviously dont connect the 3rd wire thru the device, - if you want to
bypass the device on occasion the a double pole relay accross it and
another master socket after the device will allow that.

Keith Doxey wrote:
>
> Hi All,
>
> As promised here is the info on stopping your phones from ringing.
>
> http://www.diyautomation.co.uk/projects/silent_phones.html
>
> Hope that helps
>
> Keith
>
>
>  
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