Power to Arduino Uno on Vin Pin

Hello Guys,

I power the arduino uno with regulated LM2576 12volt to Vin pin and GND. But I didnt get any LED blinking on the board. Even I have written the code which blink the LEDs that also not working while applying the Vin supply.

Any help would be appreciated.

Thanks
Rakesh

Show us a good schematic & image of your circuit wiring.
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