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Posted by DTC on December 21, 2007, 4:39 am
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>
>> chip@chipanddebby.com wrote:
>>> I posted a couple of years ago and you helped, but I lost the info. I
>>> have 2 old western electric dialless phones a 553a and a 653a i would
>>> like to set them up to use as an intercom type situation. could you
>>> please help me out??
>> Easiest solution would be a simple Radio Shack 24 or 18 volt DC power
>> supply on the tip and ring of the phones and a small 12 volt DC piezo
>> buzzer on the spare pairs with a pushbutton to "ring" it.
>
>
> they both have ringers in them, the old bear gave me a solution a few
> years ago, I just lost it
Well you could use ringers, but its not so easy a solution. You'd need
a 90 VAC power supply and a way to detect ring trip to stop the ringing
or feed it on the spare pairs), then a balanced 24 VDC feed (although
you could get away with a ground sided one).
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