Accuracy and control are especially in great demand in the domain of test and measurement systems in today’s digital world. For that reason, there is much room for improvement in the design of the digitally controlled programmable attenuator circuit in terms of accuracy and flexibility of signal processing. The following article guides on how to design a programmable attenuator circuit with the OP07 operational amplifier and CD4052 analog multiplexer. Combining them yields a high degree of signal attenuation in a digitally controlled manner, quite essential in instrumentation and test or…
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How to Build a Precision Amplifier Circuit Using OP07 and CD4052 Multiplexer
In many electronics projects, you need to amplify weak signals without adding noise. This article will guide you through building a precision amplifier circuit using OP07 operational amplifiers and a CD4052 multiplexer. The great thing about this design is its ability to switch between different input signals, making it versatile for applications like sensor interfacing, data collection, and instrumentation. What is a Precision Amplifier? Simply put, a precision amplifier boosts small signals—like those from sensors—without adding much noise or distortion. These amplifiers are often used when accuracy matters, such as…
Read MoreDIY High-Gain Audio Amplifier: How to Build a Sound Booster for Stealth Recording
Are you looking to amplify faint sounds or whispers from across the room? Whether you’re into audio surveillance, DIY electronics, or just curious about boosting sound levels for personal projects, this guide will walk you through building a high-gain audio amplifier—the ultimate sound booster for stealth recording. With this tiny gadget, one can turn any modern recording setup into a powerful tool that will be capable of picking up even the faintest sound or conversation present in the room. Be it for surveillance, sound recording, or just playing around with…
Read MoreExploring the ICL8038: Building an Audio Function Generator Circuit
Introduction: In the world of electronics, different types of waveforms are essential for testing various circuits. A sine wave signal is commonly used for assessing linear circuits such as amplifiers and filters. In contrast, a square wave input becomes crucial when testing digital circuits like flip-flops, counters, and registers. In this article, we’ll delve into constructing and operating an audio function generator utilizing the specialized integrated circuit, ICL8038. Notably, this audio function generator circuit offers not only sine and square waves but also triangle waves. Circuit Description and Operation of…
Read MoreSimple White Noise Generator Circuit
A signal which contains almost all frequencies is called white noise. In an audio system white noise contains only audible frequency. The white noise of the electrical system is analogous to white light from optics, where white light contains all frequencies or colors. White noise is mostly used in the testing audio equipment like pre-amplifier, power amplifiers, filters, etc. Check out the article on Electrical noise | Types of Electrical Noise. So, today in this article we are going to describe a simple white noise generator circuit. This circuit can…
Read More10 Band Graphic Equalizer Circuit
This article is dedicated to those who want to make their high-quality low distortion 10 band graphic equalizer circuit. Before going to the circuit and it’s working let’s understand an equalizer and its types. An equalizer is simply a device that is attached to an instrument and with the help of this equalizer, we can set bass, middle, or treble. Sound or audio has a spectrum where frequencies are classified into different ranges. So, what are these bass, middle and treble? These are the range of frequencies, where the bass…
Read MoreDual Microphone Preamplifier Circuit
The microphone is a transducer that converts sound signals to electrical signals. The output electrical signals are very weak ranging from 1 millivolt to 100 millivolts. Microcontrollers like Atmega328 (Arduino), PIC, STM, etc. cannot detect this signal effectively. Thus, we need an amplifier section. The project posted here is of dual microphone preamplifier circuit which amplifies lower electric output signals of the microphone and makes it suitable for microcontroller input. Checkout other microphone amplifiers and preamplifier circuits posted in bestengineeringprojects.com Dynamic Microphone Preamplifier Circuit Microphone Amplifier using Op-amp 741 IC…
Read MoreBest Audio Amplifier Circuit
Electronics hobbyist love to design their own gadget which cam be used in our daily life. In the website Best Engineering Projects, we had published 100’s of such project which make life easy and sophisticated. In this post you will learn how to design your own Best audio amplifier circuit with premium specification. Specification of Best Audio Amplifier Circuits Output impedance of the circuit: 0.01Ω Frequency response i.e. working frequency: 20 Hz to 40 KHz Total harmonic distortion: 1.2% at 3W. Load or Speaker at output: 3Ω to 8Ω Description…
Read MoreFour Channel Audio Amplifier Circuit
Single channel audio amplifier is readily available over internet, generally we combine multiple single channel amplifier in order to built multiple channel amplifier. But here in this post you will learn how to design four channel audio amplifier circuit using TDA1554Q IC. This type of circuit is very useful in sound lab, school, office etc. where we need multiple into and multiple output. Specification and Advantage of Four Channel Audio Amplifier Circuit Four input and four output port At load it provides 11W of power and at load it provide 6W…
Read MoreStereo Amplifier Circuit Diagram
Stereo Amplifier Circuit Diagram we are going to design here is basically the combination of two mono audio amplifier. Portable and good audio amplifier is still a major concern to many electronic hobbyists and professional. People are still searching for good portable and battery-operated stereo amplifier. So, here in this article you will learn about designing of stereo amplifier using two audio amplifier IC. This stereo amplifier works with low voltage battery (4.5V, 6V) or even with a USB interface (+5V). In order to achieve above specification, we most design…
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