Old alarm clocks and many doorbells and telephones emit a signal due to the blows of “hammer” metal hemisphere of the bell.
If you are annoying it’s pretty sharp rattling, stick a bell in place of hitting it square of adhesive tape or medical adhesive tape device will beep “whisper”.
.
Recommend to read
THE VICTORY OF THE DEBUTANT
In the history of the world Cup on aviamodelling sports, this has not happened; 42 athlete speakers with models of gliders, after seven rounds was the maximum number of points — 1260....
MINI HELICOPTER FREE FLIGHT
The twin-engine helicopter model. The creation of radio controlled model helicopters is one of the most difficult types of modeling. So complex that at the present time, almost nobody...
