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
BREADBOX-SORCERESS
What place does the bread on our table, understandable and to the children no wonder the old Russian saying says: "Bread is a head". Frugal, rational use of it depends on how long he...
WILL FOIL
Modern kitchen stool with screwed-on legs all good, except one: for some reason, no-no one of the legs starts to spontaneously otsenivaetsya. The simple tip will help to fix reliably a...
