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
GATE – UP
Motorists are well aware how much trouble delivering the usual garage double gates. Particular difficulties arise in the winter when you have almost every day to clean the snow in front...
SUSHI ON THE WATER
There are still many of Russia's rivers and lakes that can deliver joy and pleasure to fans of rest on water. But most reservoirs where you can swim in the boat, away from settlements....
