LED Flasher Using Transistor

This simple LED flasher using transistor,  an LED flasher can be made ​​that can be used for example to simulate the existence of an alarm mounted in a vehicle driver.

LED Flasher Using Transistor Circuit Diagram:

LED Circuit Diagram

The circuit is a relaxation oscillator built around transistor T1 Unijunction that provides repeated pulses with a duration of a few milliseconds, Darlington transistor T2. When the contact is closed the LED is blocked through T3.

The circuit has a current actual consumption of only 2 mA. Resistors R1 and R3 will be resized to compensate for higher tolerances resulting from manufactured Unijunction transistors. Do not use in the assembly of high power LEDs (current peaks should not exceed 250 mA).


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