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Way back when [Ms Ellsworth] was a kid, she kept seeing the same circuit over and over again in her various op-amp books. It was a Wien bridge oscillator, a small circuit that outputs a sine wave with the help of a light bulb. Now that [Jeri] is much wiser, she decided to play around [...]

Tags:  oscillator circuit jeri ms-ellsworth wien wien-bridge-oscillator light-bulbs sine-wave Hardware  

[Jeri] has had a bear of a time moving up to Valve Software, but electron microscope is safely in her garage (!) and her electronics lab is slowly taking shape. Since she can’t bring out the real-life gravity gun she’s working on, she decided to show off a one-bit ADC that uses just a flip-flop to [...]

Tags:  adc delta jeri electron-microscope delta-sigma electronics-lab Hardware  

[Jeri Ellsworth] finally set aside some time to talk about the build process for her Commodore 64 bass keytar. We think what started by taking a band saw to the guitar body ended up as a fantastic new instrument. When she was showing off the project at Maker Faire we really only got a cursory [...]

Tags:  bass ellsworth jeri jeri-ellsworth commodore-64 guitar-body musical hacks  

[Jeri] built this really cool C64 bass Keytar from a commodore64 and a cheap bass guitar. She’s using an FPGA to do the string detection and the key scanning, it then sends everything to the original 8bit sound chips. The reason that she is using a bass guitar is that the commodore sound chip only [...]

Tags:  keytar bass jeri sound-chips commodore64 sound-chip digital audio hacks  

[Jeri Ellsworth] has been working on a direct conversion receiver using an FPGA as an oscillator and a PC sound card DSP. Being the excellent presenter she is, she first goes through the history and theory of radio reception (fast forward to 1:30), before digging into the meat of the build (parts 2 and 3 [...]

Tags:  radio ellsworth jeri direct-conversion-receiver jeri-ellsworth software-radio classic hacks  

[Jeri Ellsworth] and former Commodore Computer engineer and current full time tinkerer [Bil Herd] have a little chat on skype covering the 101′s of Phase Lock Loops in this hour long video. PLL’s are handy for many applications, but their basic use is to keep clock signals in sync. Topics covered include: Why we care, [...]

Tags:  pll ellsworth jeri jeri-ellsworth clock-signals commodore-computer how-to  

[Jeri] threw down the geeky fashion gauntlet by building this LED enhanced dress. She chose to assemble the project for her trip to BarBot 2011, and we can’t think of a more appropriate setting for such a garment. It uses a motion sensor to set off a delayed pattern of blue lights hidden underneath the [...]

Tags:  someone dress jeri barbot motion-sensor gauntlet led hacks  

Back with another interesting vidoe, [Jeri Ellsworth] once again brings us an amusing and educational hack. This time she’s made a “shooting gallery” in the style of the old arcade games that actually used projectiles. In her version however, she’s using LEDs in the targets which are detected by the gun.  In an effort to [...]

Tags:  gallery ellsworth jeri jeri-ellsworth old-arcade-games shooting-gallery misc hacks  

[Jeri Ellsworth] recently released another video in her “A-Z of Electronics” series – this time Capacitors are the subject. As a penance for my boneheaded AC Capacitor suggestion yesterday (I swear it was lack of sleep talking), [Caleb] suggested that I be the one to write this article. Since I’m not an electrical engineer (I [...]

Tags:  capacitors electronics jeri caleb jeri-ellsworth electrical-engineer lack-of-sleep news  

[Jeri Ellsworth] has been very excited about this new opportunity. She sent us a “pilot video“, so we’re assuming that there will be more to come.  In the pilot, she explains how to build a musical art installation that will play music when a viewer is in position. She covers several different ways to detect [...]

Tags:  show pilot jeri several-different-ways musical-art art-installation news  

A failed chemistry experiment led [Jeri Ellsworth] to discover a flexible substrate for electroluminescent displays. We’re familiar with EL displays on the back of a glass panel like you would find in an audio receiver, but after making a mesh from aluminum foil [Jeri] looked at using the porous metal to host phosphors. She starts by cleaning [...]

Tags:  experiment chemistry jeri flexible-substrate chemistry-experiment porous-metal hacks  

[Jeri's] back with a series of videos that outlines the step-by-step electroluminescent wire manufacturing, making EL panels from PCBs, and assembling power supplies for EL hardware. These concepts are actually quite approachable, something we don’t expect from someone who makes their own integrated circuits at home. The concept here is that an alternating current traveling [...]

Tags:  wire power jeri electroluminescent-wire integrated-circuits pcbs chemistry hacks  

[Jeri Ellsworth] adds electroluminescent wire to the list of things she makes. The materials list is incredibly low. The common components are epoxy coated magnet wire for the center conductor and bare wire for the second conductor. The part you don’t have on hand is phosphors, although she does link to a source. The bad [...]

Tags:  conductor wire jeri jeri-ellsworth center-conductor magnet-wire chemistry hacks  

[Jeri] got her hands on some of the DuPont Luxprint EL ink and had some fun conducting experiments. She tried different materials for the base and the display itself.  Not only does she just play with materials, she also tears apart a VFD and an LCD to see if she could use them for parts. [...]

Tags:  fun electro jeri jeri-ellsworth different-materials vfd tool hacks  

[Jeri Ellsworth] made this silicon inverter at home, by hand. It took her two years to get the process figured out and achieve something we didn’t think was possible. The complexity of manufacture, and the wide range of tools and materials needed seem insurmountable but she did it anyway. Her home chip fab Flickr set [...]

Tags:  ellsworth home jeri chip-fab home-chip flickr classic hacks