…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
INTERCEPTOR ON THE TRACK
Durability, simplicity, and good handling are the main requirements for cordovil models for beginners. Model, which offers this publication as a study, fully meets these requirements. The...
HOW to MAKE a GUY
for the fifth year I subscribe to your magazine and I like it very much. It is always possible to choose good advice, interesting drawing. I am engaged in ship modeling circle at the...
