In article ,
Frank Erskine wrote:
Did UK and US ring intervals. Used a mains to 6 volt transformer
the wrong way round to get the volts from the oscillator.

Allegedly it didn't work with a traditional 1000 ohm bell, but it did
ring it OK. It was better however with the newer 4000 ohm ones (and of
course modern 'sounders').

I changed the output transistors to handle more current.

--
*Ham and Eggs: Just a day's work for a chicken, but a lifetime commitment

Dave Plowman London SW
To e-mail, change noise into sound.