…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
WARDROBE FROM WARDROBE
Early furniture has served its owners for quite some time, sometimes even several generations. But in our time it quickly becomes outdated morally — design or design. And then this...
TRUST CALCULATION COMPUTER
With the calculation of the resonant circuits (filters) have to face almost every radio Amateur. It is proposed to sub-contract the performance of this work a personal computer, using...
