…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
AMATEUR SPRAYER
I made it for the treatment of plants with pest garden. Gathered from local funds, mostly from the motor from the sewing machine, and gear-type oil pump of the motorcycle "Ural"....
THE BENCH IN THE HALLWAY
MATERIAL: metal rod Ø 4 and 5 mm, cut sheet metal with a thickness of 2 mm, Board thickness 18 mm three-layer plywood, bolts М3Х20 mm, glue for wood, colorless furniture varnish, primer...
