…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
DURABLE CENTER
Woodworking lathes are designed to teach carpentry students in schools, universities and other educational institutions, and the machines home handymen often equipped with a tailstock...
WINGED TRAINER
To the journal is receiving increasing numbers of letters from modelers who make their first steps in the class RC. And, as a rule, one request — publish a description of the glider or...
