Sound bomb humming

[Rekusu]

Have the replacement panel up and running and since if it activates, it is impossible to hear the external sounder in the house and particularly if entry is from the back.

So this time, I have fitted a sound bomb, if for no other reason that the excessive inside noise is slightly disorienting.

However, I now have a very faint humming from the sounder and wondering if it is induced by the incoming mains.

The red line is roughly the cables from the sounder that go on the bell terminal on the board. These two wires go under the plastic housing and enter the interior just below the terminals. The yellow lines are the mains to the transformer.

I know little about the science of electricity but could the transformer and/or the incoming mains be inducing a micro current in the sounder wires that is causing the sound to hum?

If so, what is the solution? Reroute the wires so they do not cross the incoming mains or go under the transformer? Reposition the sounder?

Grateful for any suggestions.

Compliments of the season to one and all,

Rex

 

[Rekusu]

Moved the sound bomb to below the panel so the wires are not immediately adjacent to the mains or transformer, and as expected, the humming has stopped.

Toodle pip and compliments of the season