Step 1: Material
the materials required are -
3 × BC547 transistor ( or equivalent like BC548, etc. )
1 M ohm resistance (R3)
100K Ohm resistance (R2)
200 Ohm resistance (R1)
9V battery and clip
PC board ( the bord in which all components are soldered )
1 Small LED ( i used red coloured one )
1 Old Antenna ( at first i used the soldered wire to test and then fixed the antenna )
cardboard and a plastic box
Step 2: Diagram
join wires to led so that you can fix it anywhere wherever u like irrespective of the board.
also switch is placed to make sure it is easy to place the board in the box.
now using a tape and cardboard and paste it under board so that it is save when you place it above battery and there is no short circuit.
Step 3: Final Assembly
go out for a hunt or just prank your friends.
have fun and don't get a heart attack ;)