…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
“GOLDEN RING-87”
On the velomobile today know everything. Mention them in the headlines. Problems biomodov discussed in the popular TV show "you can". And finally, cars with a muscular drive — the...
AND FROST IS NOT A HINDRANCE
Using rimed with frost glass not distinguish outdoor thermometer. I took clear packing box from a toothbrush and even in the summer, stuck it on a dry glass, by placing a thermometer...
