Top 25 Electrical Mini Projects

Earlier, we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students. So, now we are providing the list of the top electrical mini projects ideas in this page. As many engineering students are searching for the best electrical projects from the 2nd year and 3rd year, we are providing this list of projects. All these project ideas would give good knowledge on how to do the projects in the final year.

Related Post – Electronics Projects for Engineering Students

Top Electrical Projects

So, we hope this list of electrical mini projects ideas are more helpful for many engineering students. You may write your comments and new projects ideas also by visiting our contact us page.

Top Electrical Mini Projects List:

Auto Night Lamp Using LED:
Auto Night Lamp Using High Power LEDs is a circuit which turns ON the LED lights interfaced to it at night time and it turns OFF the lights automatically when it is day. It is a light sensing device as it uses a light dependent resistor. It is a very useful circuit especially when used in street lights which can be turned ON and OFF automatically.
Anti Bag Snatching Alarm:
This is a simple alarm circuit to thwart snatching of your valuables while travelling. The circuit kept in your bag or suitcase sounds a loud alarm, simulating a police horn, if someone attempts to snatch your bag or suitcase. This will draw the attention of other passengers and the burglar can be caught red handed. In the standby mode, the circuit is locked by a plug and socket arrangement (a mono plug with shorted leads plugged into the mono-jack socket of the unit). When the burglar tries to snatch the bag, the plug detaches from the unit’s socket and activates the alarm.
Automatic Plant Watering System:
This one of the most useful project in our real life. It helps us in watering plants automatically without any human interference. We may also call it as Automatic plant irrigation system. We know that people do not pour the water on to the plants in their gardens when they go to vacation or often forget to water plants. As a result, there is a chance to get the plants damaged. This project is an excellent solution for such kind of problems.
Water Level Indicator:
The Water Level Indicator employs a simple mechanism to detect and indicate the water level in an overhead tank or any other water container. The sensing is done by using a set of nine probes which are placed at nine different levels on the wall of the tank (with probe1 to probe8 placed in ascending order of height, common probe (i.e. a supply carrying probe) is placed at the base of the tank). The level 8 represents the “tank full” condition while level 1 represents the “tank empty” condition. It can be used in automatic ON and OFF of the motor depending on the water level. It can also be used as fuel level indicator in vehicles.
IR Remote Control Switch:
By using this circuit, we can control any house hold appliance with the help of remote. Electronic appliances like television, radio, air conditioner etc. can be controlled. In this project, there are two parts: one is the transmitting section (remote) and the other is receiving section which is stable and connected to the appliance.
Battery Charger Circuit Using SCR:
Here is the circuit diagram of battery charger circuit using Silicon Controlled Rectifier. Using this circuit, we can automatically charge a battery when its charge is below a threshold and the circuit is disabled when the battery attains full charge. SCR is used in rectification circuits, inverter circuits, power control circuits, etc.
Stun Gun Circuit:
This Stun gun circuit produces high voltage and low current signal. It is mostly used as a weapon to stun or send shock waves to the target with the intention to weaken or paralyze it. It can be use in modern warfare, protection from intruders or animals.
Digital Voltmeter Circuit using ICL7107:
Here we designed an analog to digital converter to work as a Digital Voltmeter using a low power, three and half digit A/D converter IC L7107. It can be used to measure both AC and DC voltages in the range of 200 mV to 2 V with an interval of 0.001 V.
Variable Power Supply and Charger:
This is a circuit which helps to check or test your electronic projects at your workbench and also to charge the Mobile phone batteries. This circuit is also very useful during power cuts (blackouts) as it can also work as an emergency light.
Voltage Doubler Circuit:
This is another kind of circuit which helps to convert 12V DC to 24V DC. It can be used in appliances that require 24 V DC supply like radios, lights, automobile electronics, special purpose UPS etc.
Celsius Scale Thermometer using AT89C51:
This Celsius Scale Thermometer circuit is designed using AT89C51 (microcontroller) and LM35 (analog temperature sensor). This circuit works on analog to digital conversion principle. The temperature can be displayed using an LCD. It can be used at homes, mobile places like cars to keep a track of the temperature.
Cell Phone Detector:
This is a simple circuit which helps to detect the presence of an activated cell phone by detecting the signals in the frequency range of 0.9 to 3GHz. It helps in tracking mobile phones particularly in examination halls or important conferences. It can also be used to detect the mobile phones of spies or in case of unauthorized data transmission. The radius of this detector is 1.5 meters.
Temperature Controlled DC Fan using Microcontroller:
The main principle of the circuit is to switch ON the fan connected to DC motor when the temperature (measured through a temperature sensor) is greater than a threshold value. This can be used in home applications particularly in CPU to reduce heat by automatically switching ON the fan.
Stress Meter:
This stress monitor lets you assess your emotional pain. It can indicate three levels of stress: Relaxed, Moderate and High levels with the help of a series of LEDs (combination of green, yellow and red). If the stress is very high, it gives visual indication through the LED display along with a warning beep. The gadget is small enough to be worn around the wrist.
Bidirectional Photoelectric System:
Photoelectric detectors are usually unidirectional i.e. they are able to detect when someone enters a particular area but not when leaves it. On the contrary, a system able to detect movement in both directions could be useful to control shops, rooms etc. If installed in a shop it could allow knowing if all customers entering the premises have left them at the end of the day. Or, at home, it could be used to switch on the light (or any other electric device) when one enters the room and to switch off the electric device when he or she leaves it. Additionally it can be used to control the number of people as this circuit switches off the electrical device only after the last person leaves the area.
Self-powered Fast Battery-Tester:
This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It features two ranges depending on the position of the switch. In one position, the device can test 3V to 15V batteries and when the position of the switch is changed, only 1.5V batteries can be tested. A set of LEDs are used to indicate the charge of the battery (i.e. full, weak or empty).
Low Cost FM Booster:
Here is a low-cost circuit of an FM booster that can be used to listen to programs from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. It boosts the FM reception by amplifying the weak FM signals.
Self-Powered Door Bell Watcher:
This very simple and self-powered device was conceived to allow a person to monitor if someone has rung his home door-bell when he was out. The circuit must be simply connected to the two door-bell-coil leads. An LED or a buzzer (or both) can be used to indicate the event (event is door-bell being pressed). It can store the event for a minimum of 15 days. It can be used for any mains supplied device like computer, television etc.
Fridge door Alarm:
This fridge door alarm is a light sensing circuit. It should be placed in the fridge (enclosed in a small box) near the lamp or close to the opening. When the door is opened, the light from the lamp or outside will fall on it and the buzzer goes off for a certain time and stops. This process repeats until the door is closed. This circuit is useful when the fridge door is not closed or it is kept open for a long time.

Design of PM Generator for A Vertical Axis Wind Turbine:
The use of wind power is increasing in today’s World where the usage of non-renewable fossil fuels is at its peaks. There are many systems that convert wind energy to electrical energy. A direct driven permanent magnet generator has been designed specifically for vertical axis wind turbine. The generator maintains high efficiency and has high torque capability for the entire operational regime.
Energy Leak Detector:
This circuit is primarily used to detect draughts around doors and windows which cause energy leaks. This circuit is essentially a temperature sensor and can be used where sensitive temperature detection is needed. It makes use of a comparator and detects the slight changes in temperature by comparing it to room temperature (ambient temperature). A couple of LED’s (RED and GREEN) are used to indicate the change in temperature whether it is above or below the room temperature.
Infra-red Level Detector:
This circuit is a level sensor or proximity sensor. It can be used to detect the level of a liquid in a tank without any contact. It operates by detecting the distance from the target by reflection of an infrared beam. The range of the device can be set from a few cm. to about 50 cm. by means of a trimmer. The range of the device is dependent on the infrared transmitting and receiving LED’s used and is mostly affected by the color of the reflecting surface. Surfaces with black color greatly lower the device's sensitivity.
Power Grid Control through PC:
This circuit is a level sensor or proximity sensor. It can be used to detect the level of a liquid in a tank without any contact. It operates by detecting the distance from the target by reflection of an infrared beam. The range of the device can be set from a few cm. to about 50 cm. by means of a trimmer. The range of the device is dependent on the infrared transmitting and receiving LED’s used and is mostly affected by the color of the reflecting surface. Surfaces with black color greatly lower the device's sensitivity.
Power Management through Energy Harvesting Concept:
Portable systems are generally battery operated. In order to operate the device for a longer duration, the energy from the battery must be efficiently used. An alternative, that can act as a supplement or a replacement to batteries is harvesting energy from environment. The efficient use of harvested energy is described.
Room Noise Detector:
The room noise detector circuit can detect the intensity of noise in a room and signal through a series of flashing LED’s. Three threshold noise levels like 50dB, 70dB and 85dB are fixed. If the noise in the room exceeds a particular threshold, it is indicated with the help of LED’s. A miniature electret microphone is used to detect the noise.

Note: Also Read the important post – Electronics Mini Projects

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