High/Low Voltage Cut-out Using Op-Amp 741

Engineeering Projects
high low voltage cutout circuit diagram

Ever had that mini heart attack when the lights flicker, and you wonder if your expensive appliances just took a hit? Electricity, unpredictable as a summer thunderstorm, can be a blessing or a curse. One moment it’s steady as a rock; the next, it’s spiking like a roller coaster. That’s where a voltage cut-out circuit steps in—your personal guardian angel against electrical bedlam. Why This Circuit Matters Imagine your refrigerator humming happily along. Out of nowhere, a voltage spike bursts in like an unwanted house guest. Your trusty refrigerator can…

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Door Ajar Alarm Circuit

Engineeering Projects
circuit diagram of door ajar alarm circuit

Here is an another alarm circuit in the section of sound generator, the project posted here is of door ajar alarm circuit which alerts in every ten seconds that your door is open. Circuit Description of Door Ajar Alarm Circuit The heart of the circuit is 14-stage ripple carry binary counter IC CD4060. The working principle of the circuit is very simple, when high input at reset pin (pin 12) is given all the output becomes low and vice-versa.  Switch SW1 is used as door open/close sensor, when the door…

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Earth Quake Alarm Circuit

Engineeering Projects
design of earthquake sensor

Here is a simple project called earth quake alarm circuit. This circuit is divided into two sections. Geo mechanical detector (Earth quake sensor) Alarm circuit The earth quake alarm circuit is based on the principle that earth quake create slow and suddenly vibration. In order to detect this vibration geo mechanical detector is used. The construction of geo mechanical detector is shown in figure 2. Alarm Circuit | Earth Quake Alarm Circuit The alarm circuit is built around dual input, 4 NAND IC (CD4011) and a NPN transistor. Input of…

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Tone Control for Guitar Amplifier Using 741

Engineeering Projects
circuit diagram of tone controller for guitar amplifier

Simple guitar amplifier circuit consist bass and treble circuit which is not appropriate. A sophisticated guitar amplifier must contain individual control for very string. Here is simple tone control circuit for guitar which has individual string control with bass and treble facility. The circuit of tone control for guitar amplifier is build around two most popular and low cost op-amplifier IC 741. This circuit is designed to control tone of 6-band of frequency 40Hz, 155 HZ, 625 Hz, 2.5 KHz and 10 KHz respectively. This frequency is control by variable…

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Battery Voltage State Indicator using 741

Engineeering Projects
battery voltage state indicator circuit diagram

Here is a simple circuit using op-amp 741 called “Battery voltage state indicator using 741” used to indicate whether the battery is charged or not. The circuit shows three states of battery voltage i.e. charged, discharged, and normal using three different color LEDs (LED1, LED2, and LED3). you may also like other battery state indicator circuit Battery level state indicator (Designed using general-purpose NPN transistor 2N2222, indicate two states of battery i.e. undercharged and overcharged). 10 Level battery Charge Indicator Circuit (Designed using comparator IC LM3914, used to indicate the…

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Arduino Based Lie Detector

Engineeering Projects
light detector circuit using arduino

We have previously posted the the project lie detector, now here is is also a lie detector  using arduino.  Here is a simple tutorial to build a simple lie detector which will give visual indication  through LED arrangement whether the person speaks lie or truth.  The project uses a arduino duemilanove or uno. So the project is based on arduino. But our final circuit will be standalone circuit without attached arduino programmer. Circuit Description: Wiring diagram is very simple, we simply connected three LED to 3 different digital pins as…

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Simple RADAR Program Using C

Engineeering Projects
radar demo using c output 1

RADAR Program Using C is a graphical program written in c programming language which show how RADAR work to find distance. Note: You are free to download, use, edit, update and rebuild the program and source codes downloaded from here, But Please don’t forget to give considerable credits to Dreamlover Technology and bestengineeringprojects.com if you do so. Here you will find the tutorial to build a Simple prototype of a RADAR program. The software build will not be reliable and perfect enough to implement it in a real working environment,…

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College Information System Using C

Engineeering Projects
output 1 of college information system

The College information system using C  is a location where a student can have all the information  they need. Each section  have different information according to need of student like search class routine, bus schedule, teacher information, subject   list per /sem and campus information. This system is very useful for fresher student because they have no idea about collage teachers and many more thing. Also this system is useful for individual teacher because some time teacher forget class routine. Here is mainly two section which describe below:- 1.1 Student…

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8W + 8W Stereo Amplifier Circuit with Graphic Equalisers

Engineeering Projects
circuit diagram of 8W + 8W stereo amplifier

Various kinds of stereo amplifier are readily available in market. But if we ask for good quality stereo amplifier with graphic equaliser facility, it’s price become very high. The cheaper varieties are generally based on discrete transistors, and suffer from drawback such as uncontrolled hum, ineffective tone control, poor base response, thermal runway etc. the use of inter-stage transformers in such circuits reduces their versatility. Here you find the tutorial to build 8W + 8W Stereo Amplifier with Graphic Equalisers. Features | 8W + 8W Stereo Amplifier Circuit with Graphic Equalisers…

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Student Information System Using C

Engineeering Projects
student menu output

Here you will find the complete tutorial on Student Information System Using C. This software has various feature as listed below. Note: You are free to use, edit, update and rebuild the program source codes downloaded from here. Please don’t forget to give considerable credits to Dreamlover Technology and bestengineeringprojects.com if you do so. Project Features: Password Protection Add record List Record Search Record Modify Record Delete Record. Student Information System will not be reliable and perfect enough to implement it in a real working environment, but this project is…

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