CAN I MAKE MY 1960S FRIEDLAND DOOR CHIME STAY ON FOR A DELAY AFTER PUSH IS RELEASED?

[James]

the blue bit at the top is a clickable link

 

[Lucien Nunes]

If you are still interested in this, what are your electronic construction skills? I would do it exactly as @brianmoooore suggests, for which the parts cost would be about £4. The finished project would be about the size of a matchbox and would need to be at the chime location. This assumes a 2-core cable runs from the transformer to the chime and a separate 2-core cable from the chime to the button. We would need to know which transformer voltage the chime uses, and whether the pushbutton is illuminated.