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
VEGETABLE KINDERGARTEN
Very often we spring in Siberia is thrown long and cold And because the seedling is the most popular vegetable crops of cucumbers and tomatoes most gardeners to plant in the open ground...
BOARD AND SAIL
THE WIND IN THE CONTEXT OF The sail of the windsurfer is not the only element that produces thrust, but "the wheel" for manoeuvring. The air flow at the surface and water has a...
