LM324

These devices consist of four independent high-gain frequency-compensated operational amplifiers that are designed specifically to operate from a single supply or split supply over a wide range of voltages.

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Simple Dry Electrode EMG for Arduino

“Electromyography is a technique used for recording the electrical activity of a muscle. In order for a muscle to move, it must receive an electrical signal from the brain via a motor neuron, with the frequency of nerve impulses controlling …

Wink Detector

“This instructable explains how to make a “wink-detector” from a modified AD8232 ECG (electrocardiogram) sensor, an LM324-N quad op-amp, an Arduino Uno R3, and a home-made head-band. The detector has two outputs … one for when you wink your left-eye …

SPWM Generator Module (without Using Microcontroller)

“Hello everyone,welcome to my instructable! I hope you all are doing great. Recently, I got interested in experimenting with PWM signals and came across the concept of SPWM (or Sinusoidal Pulse Width Modulation)where the duty cycle of a …

Music Sensor

“There is no better components than LEDs So in this project i just made a Music Sensor that dances with the SOUND !!”

Arduino based Multimeter

“In this tutorial we will merge all the parts seen in these past tutorials here. In those tutorials we have seen how to measure resistance, current, indcutnace and capacitance. Measure voltage is very easy. In this tutorial we make a …

PCB BOT (Line Following, Obstacle Avoiding & Bluetooth Controlled Robot in a Single PCB)

“Lots of line followers are available on the internet. Most of them are made using separate modules. Several single PCB designs are available but all three functionality like Bluetooth control, obstacle avoiding and line following is not available in a …

The GoodNightLight: a Simple Nightlight Circuit

“Hi all, I teach a Bioinstrumentation course for middle school students in the winter as a part of Purdue GERI (Gifted Education Resource Institute). In this course, I introduce students to basics of circuits and how we use circuits in …

DIY Mini Oscilloscope

“Build this small oscilloscope. Frequency range is up to 40KHz(25uS full screen) In 4 selectable ranges. Input voltage is between 50mVpp and 50Vpp in 2 selectable ranges. Gain is adjustable between 1 and 100. Accepts AC or DC input …

Make Your Own LED Battery Level Indicator

“In this project I will show you how we can use the classic LM3914 IC to create an LED Battery Level Indicator. Along the way I will show you how the IC works and explain why it is not the …

Make Your Own Awesome VU Meter!

“Today we are going to look at the VU meter, it’s fundamentals and it’s build. By the end of this tutorial, you will have made your very own VU Meter!”