Category: 555 Timer Projects

Sound Activated 0-30 Minutes Timer Circuit

Engineeering Projects
30 minutes timer circuit using 555

The project “Sound Activated 0-30 Minutes Timer Circuit” is a simple project designed using timer IC 555 and LM324 Quad op-amp IC. By using this project, one can activate or de-activate the appliance using sound, and the time delay can be adjusted from a few seconds to 30 minutes. Application: The applications of the project Sound Activated 0-30 Minutes Timer Circuit are: Used as a sound-activated burglar alarm. Used as timer circuit in kitchen, house. used for appliance operations like refrigerators, TV, Rice-cooker, etc. by adjusting the time as per…

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IC 555 Based Automatic evening lamp

Engineeering Projects
automatic evening lamp using 555

The project “IC 555 based Automatic Evening Lamp” is simple and built around timer IC 555 and LDR. The bulb used in the circuit is turned on automatically in low light (evening) and turned off in the morning. Various other automatic night lamp circuit is already posted on betsengineeringprojects.com. Some are listed here, Automatic Night Lamp Circuit using TRIAC and SCR, Automatic night lamp using 7486 IC, Light Sensor Switch Circuit using LDR, and 741 IC. The circuit posted here is a standalone automatic evening lamp; simply you have to connect…

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Opto Reflective Sensor using 555

Engineeering Projects
opto reflective sensor circuit using 555 ic

The DIY project posted here is of Opto Reflective Sensor using 555 IC and TCRT5000 module. These sensors are photoelectric sensors, which signifies that they rely on photo or light and do not need to be in contact with any other objects to sense. When a beam of light between the reflector and light sensor is interfered, that is when the sensor sends electrical signals. These electrical alerts are the information to the output unit. These days opto reflective sensor is used in various projects like proximity sensing, position detector,…

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Phase Sequence Change Indicator

Engineeering Projects
3-phase sequence change indicator

The project phase sequence change indicator using 555 IC is used to indicate whether there is a change in phase sequence occurring or not by a beeper or a LED. We all know that in three-phase motor phase sequence is important because the change in phase sequence may cause trouble in machines. Circuit Description of Phase Sequence Change Indicator The circuit of phase sequence change indicator is divided into two main sections i.e. controlling section and the beeper section. The circuit of the phase sequence change indicator is shown in…

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Auto Cut Circuit for Over and Under Voltage

Engineeering Projects
auto cut circuit for over/under voltage

The project “Auto Cut Circuit for Over and Under Voltage” is designed to protect electrical and electronic devices from over and under voltage which ensures a long lifespan of this device. An “Auto Cut Circuit for Over and Under Voltage” has been presented here serving multiple purposes for security; under-voltage protection, over-voltage protection, auto reset, auto cut off, and regulation. Circuit Description of Auto Cut Circuit for Over and Under Voltage The circuit diagram of “Auto Cut Circuit for Over and Under Voltage” is shown in figure 1. The entire…

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Pachisi Circuit Game using 555 IC

Engineeering Projects
pachisi electronics game circuit

Pachisi game is a game similar to backgammon played mostly in Indian subcontinent, in which cones and cowries shells are used instead of counter and Dice. The game is played on a board between two persons, with the pieces moved in accordance with the throws of the cones or cowrie shells. This is an interesting game to test the ‘frustration quotient’ of the players. The rectangular board includes a number of red and green circles. Opponents start from the same square and move in opposite directions. The player who reaches…

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Dual Trace Generator Circuit

Engineeering Projects
dual trace generator using 555

A single beam CRO can be used for simultaneous display of two signals using this simple circuit “Dual Trace Generator Circuit”. The circuit uses one NE555 and two LM741 ICs, besides some passive components. The diode (1N4148) is used to get a 50 percent duty cycle. Circuit Description of Dual Trace Generator Circuit IC 555 is connected in astable mode and acts as a self-switching analog switch between the two signals to be displayed on the CRO. The output of IC 555 is given to the CRO. In order to…

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10-Channel Multiplexer Circuit using 555 IC

Engineeering Projects
multiplexer circuit for 10 channel

This project is a low-cost multiplexing system for ten channels. The project 10-channel multiplexer circuit using 555 IC can be used as an add-on device for a single point indicating system. Both auto and manual selection are incorporated with the visual indication of channel number. It is suitable for signals concerning a common line. However, for double-ended signals, the input LOW lines can be made common and the input High lines can be multiplexed. This can be used for thermocouple signals, strain gauges, and any other AC/DC signal in the…

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Wireless Mobile Charger Circuit Diagram

Engineeering Projects
wireless power transfer receiver circuit

Wireless Mobile Charging is one of the trending topics in the field of electronics thus we also decided to build a Wireless Mobile Charger Circuit Diagram using various commonly available components. The project Wireless Mobile Charger Circuit Diagram posted here can deliver 271mA at 5.2V so you charge mobile phones and also can be used to drive low power loads such as LED1 and LED2 as shown in figure 2. Working Principle of Wireless Mobile Charger Circuit Diagram Wireless Mobile Charger uses the inductive coupling principle. In this principle, two…

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Power Saver Circuit Diagram using PIR

Engineeering Projects
PIR sensor

People are always in rush these days and they forget important things like turning the lights off in addition to a few other electrical devices. This results in either an electrical explosion or wastage of power. And, so to eradicate such issues, we have developed a Power Saver Circuit Diagram based on a Passive infrared sensor that employs a PIR motion sensor to detect the presence of human beings and as they leave the room, turn any electrical appliances connected to the circuit after a certain defined time interval. The…

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