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
BATTERY, YOU TO REFRESH?
While still in school, I restored the spent battery pocket receiver rather primitive, but effective way. With pliers gently removed the graphite rod and filled the battery with water....
ELECTRIC VEHICLE “IVOLGA”
"Oriole" — so I called built for the son of the electric car. The design idea came to me about two years ago, and much credit for this journal "modelist-Konstruktor". Several months of...
