In this circuit we are going to use he well known LM317T Or Lm317 Volage reulator As a Flashing Light lamp bulb or even an Led (Light Emitting Diode) .The Lm317 light beacon has many uses.It can be employed as a distress signal on highways or as a direction pointer for parking lots, hospitals, hotels. Here we present a flashing beacon that uses well known regulator IC lm 317 t. lm317t regulator can deliver more than one amp . A small 12v , 10w bulb with a high quality reflector can serve as a good visible blinker.
A 12 to 15 volt 1 amp dc supply is connected to the input pin of the ic. A 12v bulb is connected to the input pin of the ic. A 12v bulb and a combination of resistor and capacitor connected between the output pin and adjust pin of the ic as shown in the figure . The ic is provided with an aluminium heat sink to dissipate the heat generated while delivering full current. Since the has an inbuilt switch on current limiter it extends the bulb life. In this circuit you can also replace the bulb with leds with some resistors.
For the shown values of resistor and capacitor the bulb flashes approximately at 4 cycles per second, the number of flash depends on the charge discharge time of the capacitor. Different values of resistor and capacitor can be used to increase or decrease the number of flashes.