What is the use of optocoupler in this circuit?
IC1 = 4066
S1...11=Push button sw or keyboard
S12=Push button normal closed
All resistors is 1/4W 5%
can i get an output of putting an led at 5th pin of optocoupler and by pressing 1,4,7 .
will the led glows when 1,4,7 is pressed ,
can u tell me any modifications if the circuit is wrong if u think
please reply for all as i m in very hard situation
The only function of the opto-coupler in this circuit is to provide an opportunity to have a wide variety of output stages. For example you could connect a micro controller circuit at the output of the op coupler , or a simple relay , or a solenoid (door lock, since its obviously a security system).
The presence of the opto-coupler dose not alter the operation of the circuit in anyway. But the circuit by itself has no meaning you will have to add a circuit at the output of the op coupler if you want to achieve something useful.