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
“YELLOW LEAVES OVER A CITY ARE CIRCLING…”
Among heartfelt-sincere songs many, apparently, about the memorable autumn, when the "yellow leaves over a city are turned, the quiet rustle under our feet lie...". Really romantic,...
FRENCH INFANTRY TANK
After the First world war, France had the largest tank Park in the world. And the main part of it were the fighting vehicles Renault FT17— without a doubt the best tanks of the last war,...
