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
FIGHTER I-5
FIGHTER I-5. Scale model 1:33. The history of this car, dubbed the I-5, began in the summer of 1927, when Polikarpov developed a preliminary draft of the fighter under the British...
AN-2 BIPLANE-SURVIVOR
The first mention of the project landing version of the aircraft, biplane, future of the An-2 is dated 1944. Then his traces are lost and emerge a year later. Then, the proposed biplane...
