…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
IMPROVE UK-4
Machine UK-4 is still popular among hobbyists and tinkerers. Over the years of its release, home craftsmen invented many devices to improve its performance and broadening the range of...
“COPPERBAR” OF “GRINDER”
The device, which I have called "cappenberg", I constructed at the time when he decided to make an improvised wheels for walking tractor. Wheels with a diameter of 320 mm were cut using...
