…The baby was cranky for a long time and finally fell asleep. A few minutes later the doorbell rings. And, of course, the baby wakes up, and now to calm his unlikely…
I propose a simple addition to the doorbell. Just say that it’s good for calls that are switched through the circuit of 220 V. Here we need a cartridge with a bulb and the switch. Everything is connected as shown in the figure. In normal mode when you press the button is actuated and a bell, and a lamp in the “quiet” — only lamp.
I. GALKIN, engineer
Recommend to read
FLOATS ON… A FOLDING COT
It is well known that fishing from a boat is better than from shore—usually such fishing is much more successful. But a boat, even a rubber one, is far from available to every adult...
THE WAY TO “EAST”
Model-a copy of the ballistic missile R-2 In 1951, took arms ballistic missile R-2 (product 8Ж38), created under the leadership of S. P. Korolev. Its performance characteristics were:...
