You can see the image of ckt diagram in video Description First of all take a general PCB For installing IC, IC jack is good for using Soldered terminal of IC jack Solder the resistance and capacitors back side connected wire now the toggle switch is completed, Let,s check it. positive wire from Pin 8 of IC to the positive(+) of supply/battery Negative wire from Pin 1 of IC to the Negative(-) of battery Output of IC frome Pin 3 to the positive of test LED And the negative of test LED to the negative of battery with a 1K resistance Two inputs from pin 2 and the positive of capacitor connected between pin 3 and 1 Short the both input, the LED will glow and dark simultaneously. It is like toggle switch. Now solder optocoupler to use circuit as laser security cirtcuit. two optocoupler are required for this solder second 555 timer IC and variable resistance. And other resistance and capacitor Solder IR sensor And solder the Buzzer too This is the Laser Pointer. Put the circuit like this, Facing the IR sensor to the LASER light to test the circuit. Now Let,s test it Whenever anything intrupt the light to the sensor, it gets on make a sound of beep. Put the circuit in any box and fix, where you want to use. If any question or suggestion,do write in comment box.If you like, HIT Like and Share.