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12 Sep 2008

Let’s build a simple digital oscilloscope.

  • Single channel 100MHz/100MSPS (100 mega-samples-per-second)
  • RS-232 based (we’ll look into USB too)
  • Inexpensive!

A simple digital oscilloscope recipe
Using parts from KNJN.com, here are the basic items of our recipe.
1 x Pluto FPGA board, with TXDI and cable (item#1121, $39.95)
1 x Flash acquisition board (item#1205, $39.95)
1 x BNC (item#1250, $4.95)
1 x Nylon standoffs (item#1270, $0.95)
1 x Male/female connectors 2×8 (item#1275, $2.95)
That’s about $88.75 so far.

Hands-on – A digital oscilloscope – [Link]

12 Sep 2008

Eagle Cad is a fantastic schematic design program. If you’re not familiar with it, be sure to learn how to use Eagle Cad. Once you create your schematic and go through a few simple downloads, you can render your circuits in 3D. Thousands of the most common components are pre-modeled for your convenience. If you have a more uncommon component on your board, it renders a blank pad in its place. Plus, you can actually create your own 3D parts too.

Render your Eagle Cad Circuits in 3D – [Link]

12 Sep 2008

Ahhh…The joy of holding your first beautiful green printed circuit board. A feeling every electronics guru understands. Eagle Cad is a fantastic free PCB design program. The learning curve is steep, but you’ll learn quickly with these fantastic tutorials.
Learn the basics of the user interface and button control.
Check out this outstanding, detailed tutorial about anything you’d possibly need to know.
This last tutorial is a bit dated, but you’ll still learn plenty from it too.

If you want to make larger boards, you’ll have to pay for a license. Otherwise, for anything under 8×10cm, you can just use the free version.

Learn to render your Eagle schematics in 3D.

Eagle Cad Tutorials: Make your own PCBs – [Link]

12 Sep 2008

This article was submited by morgoth and is part of the PCB giveaway program, so for submitting he’s work morgoth will receive a free PCB. Also in the future we’ll see more of he’s projects.

Of-course there are other projects based on this idea around the web, but what makes this one special, it’s he’s features. There are 3 stepper motors controlled by a single ATmega8 that runs at 8 MHz, and a motor driver for each motor. The motors and their drivers were recovered from an old printer. [via]

3in1 Stepper Motor Controller – [Link]

12 Sep 2008

The Wisconsin Online Resource Center has a great collection of interactive animations for learning the ins-and-outs of electronics theory and application. If you’re a visual learner, like myself, you’re likely to find these ‘learning objects’ very helpful. In addition to basic principals of AC/DC, digital/analog, logic gates, op-amps, motors, they cover pneumatics, hydraulics, sensors, and bunches more.

If you’ve found circuits confusing/intimidating in the past, try poking around a bit in the DC section, start with the basics or just click on something that sounds cool 😉 Woohoo – learning is fun! [via]

Interactive electronics learning online! – [Link]

12 Sep 2008

This DIY RFID sheild kit for Arduino will get you started with RFID out of the bag. The kit includes a 13.56 MHz RFID Mifare Module, 13.56 MHz PCB Antenna, and 4 x Mifare 13.56 tags which together with some basic soldering skills is a nice intro into the world of passive radio sensing. [via]

Build your own RFID Arduino shield – [Link]

5 Sep 2008

The COMBATT is a NiCad discharger.It is quite simple in its operation, your NiCad pack is simply discharged through a large 50 watt resistor. As the NiCad discharges, your computer ’samples’ the voltage of the battery pack on load, and marks a series of red points on your screen, i.e. it draws a line. At the point when the pack voltage just dips below 1 volt per cell (4 volts for 4 cells, 8 volts for 8 cells and so on) your computer will automatically stop the discharge of the pack.

COMBATT: the NiCad discharger – [Link]

5 Sep 2008

This circuit will give you a good, Accurate Watt Meter that can measure various power levels.In the Origional Article the Shunt was a .001 Ohm Copper Shunt giving a 1000 Watt Scale.

True RMS Watt Meter – [Link]

5 Sep 2008

This is for those of you that want a quick prototyping system that will plug into a breadboard without taking up too much space. It will mount at a 90 degree angle to the breadboard like a video card on a computer motherboard.

  • AVR Studio Compatible
  • Atmel ATMEGA168 AVR
  • 16MHz Crystal
  • VCC, 5V, and 3V Power Supplies
  • ICSP, 1-wire Debug
  • ~$15 In Parts

QuickAVR part 1 – [Link]

Quick AVR part 2 – [Link]

Quick AVR part 3 – [Link]

5 Sep 2008

This project uses RGB LEDs to create a clock face. Each hand is assigned a colour and as the hands overlap on the face of the clock it mixes the colours.

The clock uses a single AA battery to power the display which is boosted to 5 volts with a switching mode power supply. The power supply should be able to use any AA battery that is at 0.7 volts or higher, which means that it should still work fine with AA batteries that may be “dead” when used in other devices.

The heart of the clock is a DS1307 realtime clock with a CR2032 coin cell battery backup. The battery should be sufficient to keep the time for at least a couple of years.

LED Desktop Clock – [Link]





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