…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
CLIP FOR PLATES
How quickly and firmly connected to the flat parts? For example, lined with metal or other hard surface insulating mats, where access from one side? A simple and effective solution was...
MILL IN MINIATURE
The proposed mini-mill was made a few years ago, eighth-grader Edward Sarkisov in the circle of technical creativity in school No. 17 in the city of Vladikavkaz. It is designed for...
