DIY Headphone Amplifier using 741 IC

Engineeering Projects
circuit diagram of DIY headphone amplifier

Various type of amplifier and pre-amplifier circuit has appeared in this website in amplifier and pre-amplifier section. The circuit posted here is of DIY headphone amplifier which is suitable for headphone or 8-ohm speaker or more impedance. The circuit is so designed that it has no risk of overloading or distortion of either the circuit or headphone. Circuit Description DIY Headphone Amplifier using 741 IC The heart of the circuit headphone amplifier is op-amp 741 which provide suitable gain where the transistor T1 and T2 are used to drive low…

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Electronic Thermometer Circuit

Engineeering Projects
electronic thermometer using 741 IC circuit

A number of measurement circuits have appeared on this website. The project posted here is of Electronic Thermometer Circuit using op-amp 741. This circuit is suitable to measure temperature from 00C to 500C using a linear scale am-meter. The range can be extended up to 1000C using 100 microamperes. Circuit Description of Electronic Thermometer Circuit using 741 IC The circuit is self-explanatory for the experienced hobbyist and performs its task with a minimum number of components. The operational amplifier is used in compactor mode. The diodes D1 and D2 are used…

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

Engineeering Projects
high low voltage cutout circuit diagram

Various type of high low circuit can be designed using different type of IC. Here the circuit shown of high/low voltage cutout using two op-amp IC 741, with hold on facility. PARTS LIST OF HIGH/LOW VOLTAGE CUT-OUT USING OP-AMP 741 Resistor (all ¼-watt, ± 5% Carbon) R1, R7 = 10 KΩ R2 = 1 KΩ R3 – R6 = 100 KΩ R8 = 100 Ω VR1 = 10 KΩ Semiconductors IC1, IC2 = 741 ZD1 = 9.1V D1, D2, D3 = 1N4001 T1 = SL100 Miscellaneous SW1 = ON/OFF Switch…

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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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