OpAmp

An operational amplifier (often op-amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op-amp produces an output potential (relative to circuit ground) that is typically hundreds of thousands of times larger than the potential difference between its input terminals. Operational amplifiers had their origins in analog computers, where they were used to perform mathematical operations in many linear, non-linear, and frequency-dependent circuits. The popularity of the op-amp as a building block in analog circuits is due to its versatility. By using negative feedback, the characteristics of an op-amp circuit, its gain, input and output impedance, bandwidth etc. are determined by external components and have little dependence on temperature coefficients or engineering tolerance in the op-amp itself.

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Learn 741 op-amp circuits basic with example

“We often see the LM741 circuit in many projects. Sure, You can do them. But… Will it is more fun if you understand how it works? Do not worry at all. I always try to work it easy for you …

0 to 5V output Analog Hall Sensor for Foot Controller

“This project includes an analog Hall Effect sensor and an Op-Amp circuit which can be used as position or angular sensing with the benefits of no contact and wearing, high stability and wide sensing range. Two configurations of the magnet …

DIY Sensitive ADXL335 Earthquake Detector

“An interesting way to increase sensitivity and reduce the noise of the ADXL335 analog accelerometer. The ADXL335 is a low power, complete 3-axis accelerometer with analog voltage outputs. The product measures acceleration with a minimum full-scale range of ±3 g …

Heartbeat Sensor #phablabs

“Building a heartbeat detector with infrared. Taking your pulse is as simple as holding your finger to your neck and count the beats with your watch. But if you turn that mechanical pulsing action into an electric signal, you are …

Extremely Sensitive Cheap Homemade Seismometer

“Easy to build and cheap sensitive Arduino seismometer Otherwise, the seismometer itself consists of two parts, a mechanical tremor detector, and an electronic part that turns these tremors into electrical signals, amplified them and converts them into digital signals, which …

Make a Headphone Amp V2

“After discovering Cew27’sCmoy Headphone Amp a few months ago on Instructables, I’ve been inspired to build my own. I was also inspired by Koogars amazing Crystal CMoy Free Form Headphone Amplifier which I have been admiring for a …

ATMega1284 Quad Opamp Effects Box

“The Stomp Shield for Arduino from Open Music Labs use an Arduino Uno and four opamps as a guitar effects box. Similar to the previous instructable that shows how to port the Electrosmash Uno Pedalshield, I have also ported the …

Universal OpAmp Evaluation Board Using LMV321

“The Universal Op-Amp Development board is a general purpose blank circuit board that simplify prototyping circuits for a variety of Op-Amp circuits. The evaluation module board design allows many different circuits to be constructed easily and quickly. This board supports …

DIY Raspberry Pi Zero Handheld Game Console

“In this project I will show you how I used a Raspberry Pi Zero, NiMH batteries, a homemade over-discharge protection circuit, a rearview lcd and an audio amp to create a handheld game console that can play retro games. Let …

Low noise Mini Electret Microphone PreAmplifier

“The single supply microphone pre-amplifier amplifies the output signal of an electret capsule microphone to audio line levels. An op amp is used as a trans-impedance amplifier to convert the output current from the microphone in to a signal level …

LM741 Op Amp on a Breadboard

“This is an LM741 op-amp built on a breadboard. The LM741 op-amp is an 8 pin IC chip, but I thought it would be fun to build my own on a breadboard. There are four sections to the chip, it …

Op Amps for Everyone - (Fourth Edition)

“This book for Everyone is an indispensable guide and reference for designing circuits that are reliable, have low power consumption, and are as small and low-cost as possible. Operational amplifiers are essential in modern electronics design, and are used in …