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Old 10th Sep 2019, 10:49 pm   #21
Tim's Avatar
Join Date: Jan 2003
Location: Bradford on Avon, Wiltshire, UK.
Posts: 2,827
Default Re: Two DSL filters, two 706 phones, bell tinkle

My feeling is that ringing capacitors that have no bell connected to them will draw no current (or, in the case of a master socket, they will only be able to pass current through the 470k test resistor and so the loss would be insignificant). Please do correct my understanding if it is wrong - it may well be.
Yes you are correct. You only need a filter where a phone is actually plugged in, and of course the actual bells have to be connected to influence REN
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