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
SCREW ON THE CONTROL
When developing propeller systems snowmobiles, trikes, aircraft and model aircraft designer is required to know the exact values of some parameters. And most importantly — the frequency...
DESK OF SPEED SPECIALIST
"Wow, beautiful..." — that was the unanimous opinion of the participants about our high-speed cord models. After a short discussion, the boys made a "sentence" is a set of custom-making...
