Make A Simple O-scope With A FTDI Board And A Couple Of ADC’s

January 22, 2012 by Kevin Dady 25 Comments

[RandomTask] has posted a nice tutorial on how to use a FTDI serial to usb converter, and a couple analog to digital converters to make a simple software oscilloscope. Using a “Universal Serial to USB converter” and one of many FTDI break out boards, he first reprograms the chip using FTDI’s programming software to put the device into a FIFO (first in first out) mode.

From there a pair of ADC0820 8 bit digital to analog converters are wired up, and input is fed to a couple 555’s for testing. It should be noted that there is no input protection, so things like voltages above 5 volts, or negative voltages are a big no-no with this setup. It still could be very handy while working with micro controllers or other digital circuits.

Data is then sent to the computer and displayed using a VB.net program, which has some basic features like scale and triggering, but also contains a couple bonuses like Calc Freq and Calc V delta calculation.

Many people have these little serial to usb converters, and might be in need of a simple scope. If you’re one of them, then you can cobble this together pretty darn quickly, and cheaply.

DIY Ultrasonic Plastic Welding

January 20, 2012 by Brian Benchoff 40 Comments

Here’s something that may be of interest to all the reprappers, vacuum formers, and other plastic fabbers out there: ultrasonic welding of plastics. If you’ve ever wanted to join two pieces of plastic without melting them together with acetone or screwing them together, [circuitguru] is your guy.

Ultrasonic welder setups are usually reserved for companies that don’t mind spending tens of thousands of dollars on a piece equipment. There are smaller versions made for heat staking – melting plastic pillars into rivets on the work piece – and [circuitguru] was lucky enough a somewhat reasonable price.

Because the heat staking gun was a handheld unit, a rotary tool drill press was put to work. The end result is a relatively inexpensive way to join two plastic parts without screws, glue, or solvents. The bond is pretty strong, too. Check out the video after the break to see [circuitguru] join two pieces of a plastic enclosure and try to tear them apart.

Continue reading “DIY Ultrasonic Plastic Welding” →

Oscilloscope Clock Made Possible By Dumpster Diving

January 12, 2012 by Mike Szczys 17 Comments

We see people driving around the night before trash collection and reclaiming items doomed to the land fill (or on their way to recycling… who knows). We’re beginning to think we need to join those ranks. Case in point is this vintage oscilloscope which [Bob Alexander] plucked from the curb in the nick of time. Here’s the kicker, when he got it home he found it still worked! He couldn’t let this opportunity go to waste, so he figured out how to turn it into a clock without losing the ability to use it as a scope.

You probably already know that it’s possible to display your own graphics on an oscilloscope. In fact, you can buy a board from Sparkfun which will turn the scope into an analog clock, and that’s exactly what [Bob] did. But he was met with two problems, the X-axis was flipped and he didn’t have an easy way to power the board.

He struggled with the voltage supply, frying his first attempt at boosting the internal 6.3V supply to use with a linear 5V regulator. His second attempt worked though, soldering a 12V regulator to the transformer. He was then on to the X-axis correction, using a rail-to-rail op-amp to invert the signal. The project finishes by adding toggle controls and buttons on the back of the case to switch between scope and clock modes, and to set the time.

A Very Detailed Reflow Oven Build

January 1, 2012 by Mike Nathan 9 Comments

smd-solder-reflow-oven

If you do a lot of SMD soldering, a reflow oven is the fastest and most efficient way to get all those tiny components attached to your PCB. [Frank Zhao] saw the reflow ovens we featured here over the last few weeks and figured he might as well show off his rig as well. We’re certainly glad he did, because his very thorough writeup is a great stepping stone for anyone looking to construct a reflow oven of their own.

Like many others, he started off with a used toaster oven, modifying it to be controlled directly via the power cable rather than the oven’s dials. He built a small PCB to regulate the oven, which features an ATmega32u4 and thermocouple to keep the temperature in check. Control of the heating element is done using a solid state relay, for which he built his own heatsink.

He studied the reflow profile of the solder he would be using, programming the microcontroller to regulate the heating/cooling process without requiring any user input, aside from turning the oven on.

Check out the video below to see a brief overview of his system, and be sure to swing by his writeup to take a look at all the build details. There are a handful of additional videos along with plenty of pictures there, walking through each step of the process.

Continue reading “A Very Detailed Reflow Oven Build” →

Homebrew On The Rigol DS1052E ‘scope

December 31, 2011 by Brian Benchoff 15 Comments

We love our little Rigol 1052E oscilloscope. It’s seen us through some perplexing problems and loved being upgraded from 50 MHz to 100 MHz. We’ve always been pleased with its role dictating waveforms for us, but we never thought we’d see homebrew apps for our little ‘scope.

We’re not exactly sure who [Krater] is, but he’s been working on some homebrew development for the Rigol DS1052E oscilloscope. Right now the capabilities are somewhat limited; all programming is via PEEKs and POKEs. Still, this is a fairly impressive development.

This wonderful little ‘scope has already had some time in the limelight by being easy to upgrade to 100 MHz. Hopefully with the new capabilities (Tetris, somebody make Tetris), this scope will become a staple in workshops around the world.

A tip ‘o the hat goes to [Rainer Wetzel] for sending this one in. Check out the video after the break to see an almost-working game of Pong playing on the 1052E

EDIT: [krater] dropped into the comments to tell us about his blog entry. Keep up the good work.

Continue reading “Homebrew On The Rigol DS1052E ‘scope” →

Printing With Clear Polycarbonate

December 30, 2011 by Brian Benchoff 13 Comments

Those of us with 3D printers have had two major choices when selecting a material to print with – ABS, a very hard plastic, and PLA, a more brittle plastic with a lower melting point. [Alex] and [Luke] have been experimenting with printing polycarbonate and creating clear crystalline objects on a standard 3D printer.

The first foray into printing polycarbonate didn’t go so well for [Luke]. Objects came out looking very milky and there was a bit of popping during filament extrusion. The guys solved this problem by putting the polycarbonate filament in a food dehydrator overnight to get rid of the moisture. Polycarbonate has a higher melting temperature than other plastics – around 260 degrees Celsius – which can cause some problems with Teflon insulators in the hot ends of extruders. The guys didn’t have any problems with fumes, though.

If you’ve ever wanted to print something clear, it looks like it’s now possible. Check out the video after the break to see a Makerbot Thing-O-Matic printing with clear polycarbonate.

Continue reading “Printing With Clear Polycarbonate” →

Spring Clamp Tripod Mount Has Potential

December 30, 2011 by Mike Szczys 17 Comments

Admittedly this post is flirting with flamebait, but we think the concept of using a spring clamp as an iPhone tripod mount has a lot of hacking potential. Hear us out, and if we havn’t made our case you can rant about it in the comments.

[Joe] wanted an easy way to mount his iPhone on a standard tripod. We’ve seen some creative solutions for this, like using Sugru to make a removable bracket. But he went a different route, using a cheap spring clamp to grip the phone body. These plastic clamps are like over-powered clothespins, and use a screw as the pivot point. [Joe] replaced the stock screw with a longer one, then used a coupling nut which will attach to the tripod. A bit of foam on the pads of the clamp protect your device from the plastic teeth.

It’s a fine solution (if you don’t mind putting that pressure on your smart phone). But we think this would be a great way to build your own heavy-duty third hand. It would be right at home with this modular solder platform. See [Joe’s] how-to video embedded after the break.

Continue reading “Spring Clamp Tripod Mount Has Potential” →