On 22/07/2010 22:32, Graham. wrote:


It's been many years since I dirtied my hands on that stuff, It was when my Grandmother was alive and I wired an extension to her
chair-side table using an old POTS phone with most of the guts removed.

IIRC the system is very simple; primitive in fact.
A DC PSU, carbon microphones in the outside panel and the handsets
No amplification!
The phone cradle is badly made, hook switch leaf spring need adjusting contacts
cleaning, etc.

That sounds like the one! When I took the front panel off the
wall-mounted bit, I couldn't make out how the cradle switch was supposed
to work - it seem to have a couple of vertical bits of coiled springy
stuff - a bit like curtain wire from memory - but I couldn't work out
what they did!

It's very basic stuff, just make a sketch of how the cable connects to the cradle first.

At the time I was maintaining a lot of Panasonic GX PBAX systems, so had a supply of replacement carbon mic inserts.


I've got a few old phone handsets lying about - am I likely to be able
to cannibalise one of them successfully?
--
Cheers,
Roger
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