Category: IC 741 Based Projects

Wind Sound Generator Using IC 741

Engineeering Projects
wind sound generator using op-amp 741

Various sound generator projects is already posted in bestengineeringprojects.com in alarm and sound generator section. Now here is one another sound generator circuit using most popular and versatile operational amplifier IC 741. The circuit posted here is of wind sound generator using IC 741 produces wind sound. Circuit Description of Wind Sound Generator Using IC 741 The circuit of wind sound generator comprise operational amplifier 741, two NPN transistors (BC148) and some passive components (resistors and capacitors). Transistors T1 and T2 generate wind sound. A jumper is connected to emitter…

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DC Volt Polarity Indicator Using IC 741

Engineeering Projects
battery polarity indicator

Now, here is another basic electronic project using the most versatile operational amplifier IC 741 “DC Volt Polarity Indicator”. Using the project DC volt polarity indicator one can know the positive and negative polarity of DC volt. This project is very useful for electronics hobbyists to check either battery polarity or polarity at the output of the DC source. The circuit present here is so simple that even electronics beginners can understand how the circuit works. Circuit Description of DC Volt Indicator Using IC 741 The heart of the circuit…

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Operational Amplifier 741 Tester

Engineeering Projects
circuit diagram of OP-amp 741 tester

The op-amp IC 741 is a DC-coupled, high gain differential amplifier with external negative feedback. IC 741 is characterized by the almost infinite open-loop gain (100,000), almost infinite input impedance (2MΩ), and almost zero output impedance (75Ω).  IC 741 is the most popular, cheap, and easy-to-use op-amp. Various type of circuit is designed using Op-amp 741 out of which some are voltage follower, current to voltage converter and vice versa, summing amplifier, etc. Various type of circuit based on op-amp 741 is already posted in bestengineeringprojects.com on the op-amp section.…

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Automatic Light Operated Switch using LDR and IC741

Engineeering Projects
light operated switch

Along with modernization, people are more prone to the comfort zone. Several inventions have been made to meet this requirement. Following the same trend, here we have presented a simple circuit; automatic light operated switch using LDR and IC741. People are busy, every second has a vital role in our busy schedule. Why shall we waste our valuable time turning on every switch in the building? The situation turns more troublesome when one needs to reach the ground floor just because it’s getting dark and s/he needs to turn on…

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Four channel audio mixer

Engineeering Projects
four channel audio mixture circuit

As per the name of the circuit, it is clear that this circuit connects four different audio signals as one. So, it is call four channel audio mixer. Here is that simple circuit; “four channel audio mixer” using op-amplifier 741.  It is to be noted in the circuit that the op-amplifier 741 works here as an inverting amplifier. Circuit Description of four channel audio mixer: The circuit of four channel audio mixer is wired around op-amp IC 741 followed by few other active as well as passive components. The IC 741…

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Steam Whistle Circuit using 741 IC

Engineeering Projects
steam whistle circuit

The project “Steam Whistle Circuit using 741 IC” produces a sound similar to that of a steam locomotive whistle. Here, in the circuit Transistor T1 and T2 from a multivibrator, the frequency of which is set by preset VR3. This is the ‘toot’ part of the whistle. Transistor T4 amplifies white noise generated across the reverse-biased transistor T3. White noise and toot mixed by IC1. The ratio of these is set by preset VR2. IC1 is the most popular and low-cost IC 741 and is used as a low-frequency multivibrator,…

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