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LC Determination by Resonant Frequency Measurement using microcontroller

A well known L/C measurement circuit is pressed into service to make a bare bones measurement circuit. Download the AVRStudio assembly source: lgm031227I.asm. Download the AVRStudio hex file: lgm031227.hex. Left-to-right: The 5 volt regulator, the LM393 oscillator (a 0.047 uf capacitor is mounted on the LC circuit connector), the AT90S2313, and the serial connector to

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A 1 Khz Digital Sine Wave Signal Source using ATmega8515 microcontroller

A 1 Khz Digital Sine Wave Signal Source using ATmega8515 microcontroller

1 Khz From a Quartz Crystal 1 V P-P Sine Wave Calibrated Output 1 KHz Square Wave Output 900 mv Inverted Sine Wave Output (Uncalibrated) Downloads Download the WINAVR main source for the 2313 version of the firmware: 2313sine.c. Download the complete zipped WINAVR project for the  2313 version of the firmware: 1_kHz_sine_2313.zip. Also, Download

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A Noise Generator per IEC 268-1, IEC 268-5, and IEC 268-7

A related article on this site: True RMS-To-DC Adaptor for DVM Introduction This project came about when I needed to perform some reliability tests on some headphones according to IEC 268-7. The test requires operating the headphones at their rated input power for a number of hours using clipped pink noise, and muting the noise

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MAX038-Based Sweep/Function Generator With Markers using AVR ATtiny2313 microcontroller

Take Maxim’s MAX038 function generator chip, add some frills, and you have a pretty nice tool for the bench. Downloads: Main Circuit Schematic Power Supply Schematic You can build this with switches instead of buttons if you don’t want to use a micro controller. Here is the controller code. AVRStudio 4.x Assembler Source for AT90S1200A 

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An Isolated Adjustable Auto transformer using microcontroller

This is a means of testing AC mains operated circuits at variable AC voltages, and it also provides isolation to allow safe measurements of that circuit.   A fused isolation transformer and a variable auto transformer connected together in a grounded, fire safe box. What more could you ask? Find updates at www.projects.cappels.org   Introduction

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A 10 Bit LED Digital Panel Meter With Auto Ranging Based On The ATMEGA8

Downloads Download the AVRStudio assembly source for the program: M8DPM091109A.asm Download the AVRStudio hex file: M8DPM091109A.hex Find updates at www.projects.cappels.org Overview – A 10 bit digital panel meter for positive voltage only. – Input resistance: about 130k – Ranges: 0 to 10.20 volts and 0 to 102.3 volts. – Over range indication. This project came

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Photocell Amplifier using microcontroller

This is a low frequency amplifier with an adjustable transimpedance that is intended to be used to take relative measurements of a wide range of photo currents. Not having many parts, this amplifier can be put together in a short amount of time. Find updates at www.projects.cappels.org Introduction I needed to make some relative optical

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A SIMPLE MANUAL CURVE TRACER using microcontroller

Measure current vs voltage or voltage vs current over limited range with good accuracy. This was built on a phenolic board which was mounted on a plastic box. The box serves two purposes: It holds the circuit off the workbench, and it makes a nice, stable mount for the potentiometer. Find updates at www.projects.cappels.org I

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A Pretty Good LC Meter Based on the AVR using ATTINY2313 Microcontroller

A Pretty Good LC Meter Based on the AVR using ATTINY2313 Microcontroller

Calculates and displays L and C from oscillation frequency using reference components. No relays, no range switching, a minimum of controls. And it is pretty accurate too! Note: After reading this article, check out the improved, modified An Even Better LC Meter… The 2 line x 16 character LCD shows the calculated inductance and the

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