…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
VALDAI CRAFTSMEN
The picturesque surroundings of Novgorod, an ancient Russian city situated at the motorway Moscow — Saint-Petersburg somewhere halfway from the city to the Northern capital Wherever the...
SHOES FOR THE STAIRS…
There are many ways to keep a ladder from slipping. The easiest "put on" her old sneakers or shoes with a rubber sole.
