Several electrical appliances we come across make a small “beeping” sound at various times while they are switched. Devices such as computers, heaters, LCD televisions, microwaves etc. are commonly found to make a small beeping sound. These small sound signals are heard either during the time when they are switched ON or OFF or at regular intervals of their operation.
These beeping signals are hardly a second or two long enough, but are a major necessity for engineers as it signifies successful completion of certain process in the gadgets. Also, the beeping sound also acts as a reminder in several gadgets too.
This beeper circuit can be used as a power on reminder if heavy current devices like heater, electric iron etc are switched on. It gives short beeps once in every five minutes to remind the power on status. It is just like the beeper circuit used in UPS.
Fig. 1: Pin Diagram OF CD 4093 IC
Filed Under: Electronic Projects