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
RADIO MIC
We are talking about miniature and low-power VHF transmitter that operates at a distance of only a few tens of meters. The contractor, using a wireless microphone, can move freely around...
“THERMOS” FOR POTATOES
For the fourth year keep the potatoes on the balcony in a container of foam slabs of size 900X 900X 90mm, strapped together by means of aluminum corners section 25x25 mm and length of...
