Mains Trigger Musical Door Bell Circuit

Engineeering Projects
circuit diagram of mains trigger door bell

Door bell system is probably one of the earliest electronics project. Large number of projects has followed the series, each with different components and different sound effects. The projects published till now were either completely battery operated or were mains based. On doing so, the project consumed more power form a single source and sometimes didn’t even operate for desired limit of time. Here we have tried to reduce the problem to some extent by publishing the project “Mains Trigger Musical Door Bell Circuit”. This unique Mains Trigger Musical Door…

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Machine Sound Generator Using 555 Timer IC

Engineeering Projects
machine sound generator circuit

Countless projects have been developed with a variety of alarming effects. We prefer different sound effects in different places. For instance, in security-based projects sharp and alarming sound is considered the best option, whereas, in the doorbell, the soft sound is found pleasant to the ears. Thus, it is more appropriate to have related sound effects for particular areas. The project “Machine Sound Generator Using 555 Timer IC” is a similar project aiming to generate machine sound solely for industrial applications. However, the circuit Machine Sound Generator Using 555 Timer…

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Fuse Tube Light as Night Lamp

Engineeering Projects
circuit diagram of fuse tube-light as night lamp

Fuse tube light is useless what we generally think. This concept can be proven wrong by this particular project. This electronic trick let you use your fuse tube light at night lamp. The circuit comprises a bridge rectifier and a starter where, starter is used to boost up the voltage and is connected to the fuse side of tube light as shown in figure. The mains voltage is direct rectified using bridge rectifier made for four general purpose diode. The output with starter is connected to tube light as shown…

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DIY Resetting Protector Circuit for Computer

Engineeering Projects
block diagram of resetting protector circuit

Introduction to DIY Resetting Protector Circuit for Computer With the speed of development in technology, it is no wonder that a number of software have been developed to prevent computers from quick execution of rushed commands which are mostly accidental issues. However, even the most advanced computer programs do not offer protection against the accidental operation of the panel-mounted reset switch. This often leads to incomplete installation of software, improperly closed files, and results in useless memory accumulation in the hard disc. Therefore we need a device which can prevent…

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12 V Battery Charger with overcharge and deep-discharge protecting

Engineeering Projects
circuit diagram of 12V battery charger

Introduction of 12 V Battery Charger with overcharge and deep-discharge protecting Mostly in broad projects, we have seen lead-acid storage cells are often used as a backup source of electrical energy during periods of supply line failure so that the system operates efficiently. In case of mains supply failure, the energy (i.e. electrical) stored in the cell is used and later when the mains supply is available, the energy in the cell is restored from the mains through a device named a charger. The cell undergoes chemical processes during the charging…

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5 State Digital IC and Circuit Tester

Engineeering Projects
circuit diagram of 5-stage digital IC and circuit tester

Quite often electronics engineers and technicians come across the problem of fault-finding or testing electronic circuit boards full of digital integrated circuits. A handy and quick look-tool ‘5-State Digital IC and Circuit Tester’ for such an analysis is a logic probe that does the job faster and easier by just touching this probe to different pins of various ICs and observing the logic levels. Introduction to 5-State Digital IC and Circuit Tester Most of the commercially available logic probes show only two distinct levels of logic ‘0’ and logic ‘1’ corresponding…

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Fridge Alert System Circuit

Engineeering Projects
fridge alert system circuit

Different range of temperature levels settings is available in the refrigerator; varying form low, normal up to high cooling. These ranges don’t provide a precise temperature. At times, we might need to set a limit of the temperature in the fridge for some reasons like to store certain types of foods or to get the exact accuracy of temperature we want. This circuit serves us right. The project entitled “Fridge Alert System circuit” is designed for the fridge. With the help of this project, we can detect exact temperature of…

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Low Voltage Motor Speed Regulator

Engineeering Projects
IC design of Low Voltage Motor Speed Regulator

You might have noticed that the speed of DC motor is not stable throughout the project. It is because, as per the concentration or density of load on the DC motor, its rotational speed varies. For particular projects we require DC motors to operate with a constant speed. This is where this project; ‘Low voltage motor speed regulator’ is applicable. However as depicted in the project title, it can be used only with the low voltage motors. This chip is used to regulate the speed of low voltage (5 to…

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GSM based notice board Using AT89c52

Engineeering Projects
circuit diagram of GSM based notice board using at89c52

Lately, in the field of electronics use of GSM modules has been incorporated in almost 50% of the circuits for the wide range of benefits it offers. The project “GSM-based notice board Using AT89c52” also takes an advantage of the GSM module to design an electronics notice board. Being wireless, it avoids the requirement of messy wires for circuit design with LCD interfacing. It consumes less power and is easy to operate. And the main point is that it is portable. Who would deny such a circuit over a maze…

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Beeper for Automobile Flasher Using 555

Engineeering Projects
circuit diagram of beeper for automobile flasher

Flashing light is a good way to alert people around but is not the best measure. Ears can hear when eyes cannot see. Therefore using a beeper circuit is the best remedy and this concept has been utilized in modern automobiles and also included in multiple other applications. The project ‘beeper for automobile flasher’ can be implemented in old automobiles (scooters, motorcycles) where there is no beeper circuit along with a flasher. It can also be included in many other alerting projects which employ flasher circuits.  Working of Beeper for…

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