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
THE BOOK “COLUMN”
If you perform construction industrial bookcases and shelves, you will notice that their depth is normally twice the width of the book. So the books have to put in two rows, and it is...
DOOR INSTEAD OF DRAWERS
Plastic drawers commonly used in modern domestic furniture have a long life. After a few years of service, they warp, can't move on rails, and then crumble. Do the drawers only...
