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
THE AQUARIST
Do not throw away box from a failed TV he still will serve you as a "case" for the aquarium. Vnutrimyshechnogo space to accommodate not only the aquarium, but also the illuminator,...
TWO BRUSHES
To the chainlink fence does not spoil the view of a suburban area for the prescribed time, it must be carefully painted. But to make it easy. Pneumatic spray paint and hard wire, and...
