…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
MANAGEMENT OF GAS — ON THE RADIO
There is a perception that control the "gas" compression of the motor as well as nitro, is almost impossible. However, for a long time had already been quite successful systems for...
FLYING HIGHER AND FASTER THAN ANYONE
Hypersonic rocket plane North American X-15. The construction of the spacecraft reusable type Shuttle "Buran" opened a new Chapter in manned space exploration. The design of this type of...
