Mini Projects using IC 741 - Engineering Projects

Here in this post, we have compiled some of the verified mini projects using IC 741. The mini-projects using IC 741 listed here can be used as diploma-level as well as high school-level projects.

List of Mini Projects using IC 741

1. Electronics Thermometer Using Op-amp 741 IC

Here is the circuit diagram of an electronics thermometer using an operational amplifier and silicon diode having a range of -20^oC to 125^oC.2. Electronic Fuse Using Op-amp 741

Here is an electronic fuse using op-amp 741 which features slow-blow properties, a variable current limit, and a ‘live’ indication of its operation. Moreover, it is simple to restore.
3. Sound detector circuit using op-amp 741

Sometimes due to lack of concentration and our ignorance, we are unable to hear anything around us. This circuit called ‘Sound Scanner’ is what detects vibrations of the sound waves and amplifies them to be heard distinctly by human ears.4. Sound Operated Intruder Alarm with Flash

Sound Operated Intruder Alarm with extra features like a flashlight, circuit diagram, description with working principle, and parts list. This project is a transformation of that generalized project into a specialized intruder’s alarm project.

5. DIY Headphone Amplifier

The circuit posted here is of headphone amplifier which is suitable for headphones or 8-ohm speakers or more impedance. The circuit is so designed that it has no risk of overloading or distortion of either the circuit or headphones.

6. Tone Control for Guitar Amplifier Using 741

A simple guitar amplifier circuit consists of a bass and treble circuit which is not appropriate. A sophisticated guitar amplifier must contain individual control for every string. Here is a simple tone control circuit for the guitar which has individual string control with bass and treble facility.

7. Temperature Deviation Indicator Using OP-AMP 741

For laboratory work, an accurate temperature deviation indicator is more effective than a sophisticated thermometer. The electronic device temperature deviation indicator using 741 can register a difference of 0.2⁰C between the thermal sources and display it with the appropriate direction of variation.

8. Listening Bug Using op-amp 741

Here is a simple circuit called listing bug using the most popular op-amp IC 741. This circuit can be used for spying because by using this circuit we can hear any conversation held in any other room or we can say by using this circuit one can hear the conversation held in another room.

9. Adjustable Ripple-Regulated Power Supply Using 741

Here the advantage of op-amps enormous gain is utilized along with the op-amps property of keeping the inverting and non-inverting terminals at the same potential by the feedback loop comprising series-pass transistor T₁, R₄, VR_2, and R₃ op-amp 741 and diode D₃.

10. Microphone Amplifier Using Op-amp 741

Now, here is another basic project using an operational amplifier called a microphone amplifier using 741. The circuit microphone amplifier amplifies weak electric signal converted by the microphone to the necessary level.