This circuit is based on a LDR which act as a sensor to detect the shadow; NE555 is a timer IC and UM66 which is used as melody generator IC. The circuit woks on the principle of operation of LDR (light dependence resistor). LDR is a device whose sensitivity depends upon the intensity of light falling on it. The resistance of LDR decreases when intensity of light falling on it increases and vice versa (resistance increases when intensity of light falling on it decreases). In dark or in absence of light, LDR exhibits a resistance in the range of mega ohms, which decreases to a few hundred ohms in presence of bright light. Magic eye can be used as automatic guest indicator in your home. Just install this at the bottom of the door and whenever a person comes at door its shadow will fall on light dependent resistor and will ring the bell.
Magic Eye Circuit Using 4049 IC
Magic eye can be used as automatic guest indicator in your home. Just install this at the bottom of the door and whenever a person would arrive, his shadow will [[wysiwyg_imageupload::]]fall on the circuit giving an indication that somebody is present on the door without the knowledge of the visitor. It can also used as a prevention measure against vandalism. So, apart from homes, it can also be used shop and banks. This circuit is based on popularly known hexa inverter IC CD4011, LDR and a few more components. The circuit is based on NOT gate CD4049 IC. In NOT gate, we will get output as logic high when logic zero is provided and we will get logic zero when logic1 is provided in input. Keep on reading to find out how the circuit is constructed and how it works.