…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
THE LAST FIGHT “TERRIBLE”
The Russo-Japanese war, which began with a sudden attack of the Japanese on Port Arthur on the night of 8/9 February 1904 and virtually ended with the defeat of the king's fleet in the...
EASY GOING
In the "Modeller-designer" has repeatedly published materials on woodworking machines-"circular saw" circular saw and planer, so necessary for the house masters. On this publication have...
