…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
ON “SEA SLED” ON THE LAKE
There is a perception that sailing is a lot of people with high incomes. Of course, in relation to racing dinghies and cruising yachts, this is largely true. However, from a small...
DISGRACED LINER
The first post-war years were marked by the aircraft industry in the rapid development of jet technology. To increase the thrust of gas turbine engines, their efficiency and, most...
