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
SEVEN SEATER “KOMAR”
A friend of mine started making the car we are talking about in the late 1980s, when automotive abundance was just around the corner, but we didn’t know about it yet. However, as soon as...
AIR FERRY
Once in the journal "modelist-Konstruktor" I read the article "the Farmer's sloping field." The air route is very much needed in the highlands. But in nature, there are many horizontal...
