…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
URAL VS “RHEINMETALL”
The victory of the Soviet troops in the forty-second and forty-third years had tipped the scales of war in our favor. The enemy got an object lesson. Failing two consecutive critical...
“BUFFALO” AGAINST THE “SEAGULLS” AND “DONKEYS”
Carrier-based fighter BREWSTER F2A Brewster company was the first fighter monoplane taken into service by the Navy of the United States. Designed in 1937, the beginning of the Second...
