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Hi!
As Dishanth and Bhatt mentioned here, this problem may be due to insufficient power supply or more power sinking from 7805.
You may get some more detailed idea about 7805 voltage regulator by reading the post – How 7805 Voltage Regulator Circuit Works?
Once check this! I think you can get more idea about it.
Hi!
Here is the simple and best circuit diagram for mobile jammer. For complete information about this circuit diagram and its working, read the post: Simple Mobile Jammer Circuit