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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 Download the WINAVR main source for the 8515 version of the firmware: 8 ...

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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 periodically during the test. There are plenty of white noise generators around, ...

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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  fsgen050527A.asm AVRStudio 4.x hex file for AT90S1200A   fsgen050527A.h ...

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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 I need to be able to test and measure the operation ...

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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 from friend named Don's need for a digital pan ...

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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 measurements. I had some small but relatively large area photo diodes, ...

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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 realized that soon I am going to have to measure the voltage as a function o ...

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