Quote:
Originally Posted by Nick Malvern
... As far as I can see it will only supply bells wired to terminal 3, and will not help with running additional modern phones that have a 2-wire supply and derive their ring tone internally ...
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Wow! 18 months on, I'd forgotten all about this, so I've had to re-read the thread!
The first thing, which was enshrined in the first post in this thread, was that the requirement was for a REN Booster to operate a number of
vintage phones.
These will have independent access to the bell circuits and would, therefore, connect to my circuit on a dedicated bell wire.
However, if you ensure that a relay with a 4000Ω coil is used, or a relay + series resistor equalling 4k in total, the circuit will have a REN of 1, so two wire phones can still be added up to the maximum line limit
in addition to older phones with a 3/4 wire configuration.