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Minimum Mass Waveform Capture using AVR microcontroller

Capturing repetitive waveforms at 1 million samples per second using PWM and a comparator. Download AVR Studio Source wfcao 030326 .asm The impetus for developing this technique came from my own need to capture repetitive waveforms using the least expensive and lowest part-count means possible. I wanted to be able to view the waveforms on either a liquid crystal display dedicated to the purpose or upload th ...

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1750 Meter Lowfer Band amplitude modulated RF source using ATtiny2313 microcontroller

Download the firmware: mor040220BBeacon.asm [caption id="attachment_8672" align="aligncenter" width="389"] The oscillator board is not much more than the 74HC4060 oscillator/divider. The crystal is in a socket. made by cutting down an IC socket.[/caption] This is a low power signal source I put together one evening to provide 187 KHz RF signals for an anticipated receiver investigation. Under Federal Commun ...

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Frequency Meter with 100 MHz RF desktop channel using ATtiny2313 microcontroller

This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100 MHz RF interface described in the page about the RS-232 to 100 MHz RF desktop channel adapter. Built and align this is the same manner as the 100 MHz RF desktop channel adapter. The frequency meter has a maximum input frequency of 4 Mhz and counts u ...

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Low Capacitance Scope Probe Adapter

An adapter to allow low capacitance probing of high frequency circuits. Overview My boss, Dave, said "Just hold the probe close to the cathode lead." Dave had worked at Tektronix for many years, and his ability to make difficult measurements was second only to his abilities to manage a company and design clever circuits. Dave's point was that, even though we didn't have a an FET probe, we could measure wide ...

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AC Current Probe for Oscilloscopes

Overview I needed several current probes when designing the deflection circuits and high voltage supply for a computer display monitor, and the lab in which I was consulting only had one current probe, which I shared with the other four engineers on the project.  We did not really have a budget for test equipment on that project. Designing the deflection circuit included designing several inductors, a curre ...

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A Portable Precision Voltage Reference using microcontroller

Introduction It has been said that a man with one watch knows what time it is, but a man with two watches is never sure.  The same can be said for a person who has more than one voltmeter.  In my situation, I have several voltmeters in each of two different locations a third of the way around the world apart. The best solution would be to send the meters to  NIST traceable calibration labs, but that's too e ...

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Simple LM335 Thermometer using microcontroller

Not too many parts. When a voltmeter is connected across the outside terminals of the output connector, its display reads out in degrees C. I've been fascinated by the LM335 for some time -maybe my obsession with stability finally gave way to my fascination with a circuit with intentional thermal drift. I finally bought some the other day, and to check one out, I hooked it up as a thermometer, based the Nat ...

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