How nice to fall asleep to the rhythmic roar of the rain, as the happy jingle of the spring thaw! But should we depend on the vagaries of nature, when all you can hear at any time at home. It is enough to make a simple electronic device, based on a well-known multivibrator. Changing the position of the slider of the variable resistor R2 (see diagram), adjust the rhythm of the speakers B1 and B2. The device is powered from a single battery 3336L. Selecting the values of resistors and capacitors, achieve a pleasant timbre of the device. VOSKRESENSKY, Kuibyshev
Recommend to read
“GUILLOTINE” FOR THE FRUIT
Delicious, fragrant Apple-pear. And vitamins not deprived. But with the safety of these fruits until next harvest problems, and sometimes considerable. But out drying, pickles jam and...
THE RACK BEHIND THE DOOR
In many apartments you can find small "secret" and rarely used by tenants. These include, in particular, include space for doors. At the same time, they can be used for storage of...
