Sound Operated Music Bell

In this post we learn how to make a simple sound operated music bell circuit which can be installed in homes for enabling the visitors to ring the door bell by knocking on the door. A doorbell is sine qua non in every household. Most of the standard types need human intervention to operate. But […]

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Fridge Alarm Circuit

The simple fridge alarm circuit will alert the user in case the fridge malfunctions with its specified temperature cycle specifications. The use of fridge in homes has become a de facto. Recent developments in fridge have defined sophisticated systems that can run even with less human intervention. But there are issue with the old fridge, […]

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Simple Electronic Siren Circuit

This simple electronic siren circuit project aims to explain designing a simple circuit for an electronic siren. It is built on a single chip – CD4011 (IC1). In order to make this work, we need four NAND Gates with 2-input of IC1. Both the gates will be configured to manage high and low frequency oscillator. […]

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Ultrasonic Alarm Circuit

This post talks about an excellent ultrasonic alarm circuit that could be efficiently established for detecting sound pressures over the natural human hearing capability, which could cover from 20 kHz and above. Ultrasound or ultrasonic sound waves was quite possibly discovered prior to mankind lived across the globe by several of the animal variants along […]

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