The device is useful for a model fire truck and a guard system. The intervals between the signals and their duration is controlled by changing values of electrolytic capacitors C1, C3, fixed resistors R2, R4 (see diagram). Sound effects you can Supplement the indicator light, replacing the resistor R3 with a bulb from a pocket lantern 2,5ВХ0,1A. Output transformer and speaker from any small-sized transistor radio.
Recommend to read
EASY PRESERVING
Preparation for the winter vegetables, fruits and berries in many cases, connected with great inconvenience due to the imperfections of technology and primitiveness kitchen appliances...
THE AIR IS PARTICLE BOARD
Who said that the furniture in the nursery, or, indeed, in the room of a teenager must be the same as half of adult? A cottage or summer house in the garden? Yugoslav journal...
