Damn Simple LED Flasher Circuit

Introduction:

 Led flashers or blinking led lights find a lot of applications in electronics. Power indicator lights in battery powered devices have led's that flash to conserve power. Here is an extremely simple circuit to do just that.

Some of the applications:

• Battery charging indicator
• Fake burglar alarm indicator inside the car.
• Warning lights and hazard flashers
• Decorative lighting
• Hobby projects
• Solar powered flashers

The credit goes to Leo Easki and his research on the negative resistance in transistors. The following circuit is based on this principle. 

Components:

1 - 1K Resistor

1 - NPN transistor [ bd139 , 2n2222 or the like ]

1 - 10 ohm resistor

1 -330 uf Capacitor [ Any value between 330 uf and 1000 uf is ok]

1 - led

Circuit Diagram:

The input power is 12V DC. The positive is connected to a 1K resistor. The other end of the resistor is connected to the positive side of the capacitor and the emitter of the transistor.The negative side of the capacitor is connected to the negative/ground.

The collector of the transistor is connected to the 100 ohm resistor which is then connected to the positive of the led. The negative of the led is connected to the negative of the capacitor.

Here is the circuit in action: