On 13 Feb, 16:37, JohnW wrote:
On 13 Feb, 12:24, Hugh wrote:



The problem is, when the phones go off-hook, the bell goes ding,
presumably because the sudden change in line voltage goes through the
capacitor and into the bell.

Hugh

You need to put a thermistor in series with the bell. These were very
common when I worked for the Post Office and looked like this:

http://www.telephonesuk.co.uk/images/1A-1.jpg

A quick Ebay doesn't show any for sale, but there were so many used,
there must be some around

John


Thanks very much for the tip, John. I can see how that would work.
I'll keep a watch for one.