…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
SCHOOL COMBINE
A cozy little Latvian village, curly half-hidden by the green trees, densely interspersed as flat as a table field. They are spaced from each other sometimes just for a few miles, as the...
A SIMPLE PERISCOPE
In childhood, many have probably experienced the delight of the books of Jules Verne. The romance of traveling on the Nautilus is impossible to forget even after years. Today the...
