allen's projects page

Projects are presented in chronological order, starting with the most recent.
If you're interested in a custom project, I've established Artisinal Electronics to conceive and construct artisan and steampunk electronic devices.

Hammarlund shortwave radio restoration

I wasn't looking for a project like this, but I obtained this antique amateur radio receiver at a price I couldn't resist. It was not completely functional, and one of the knobs was broken, but I was able to find an exact replacement knob and to restore the radio to full functionality. Hammarlund

XLR mute switch pedal with indicator

XLR Mute I built this to mute a microphone that's connected to a sound system. It is a replacement for my original, which only worked when you stepped on it (momentary); this one can be toggled on or off at the press of the foot. This upgrade adds a live/mute indicator. Click on the photo for the schematic diagram.

USB Microscope Mod

microscope mod I bought a USB microscope from (an amazing source of inexpensive gadgets from China) for under $10 that works unbelievably well (the image to the right is of the "2" in the date of a penny). I had an old broken microscope from my youth, and retrofitted the USB scope to the old base. Voíla! sample microscope image

Programmable USB dual-pedal controller

pedal I use an Asus notepad for sheet music at performances & practices. I wanted the ability to scroll up & down hands-free, but an inexpensive version of this device is not available commercially. I therefore built a USB-interfaced pedal controllero by installing a DIY-Keyboard circuit board (from into a two-pedal device (originally intended for medical imaging equipment).

The pedals can be programmed (using PC software) to generate any keystroke or set of keystrokes when pressed.

I also built a secondary pedal that can be plugged into the primary pedal (via ¼ inch stereo patch cord), yielding 4 possible keys that can be assigned to the foot controller set (My default settings are "PgUp" & "PgDn" on the left, and "Up" & "Dn" arrows on the right.) The setup can be used with any device that can accomodate a regular USB keyboard.


High Power Magnetic Broom

magnetic broom A constant rain of micrometeorites falls to earth, but they're seldom detected. They can most readily be found by sweeping magnets across sandy beaches. I scavenged powerful rare earth magnets from dead hard drives to make this magnetic broom with that primary purpose in mind. magnetic broom

Second generation iPhone adapter

iPhone adapter I built this adapter to connect an external audio source to my iPhone, according to the schematic at right. Unfortunately it is mono only (the only way to record to the iPhone in stereo is via a more complex Lightning adapter). iPhone adapter 2

Webster-Chicago Model 288-1R wire recorder restoration

wire recorder Devices to magnetically record onto steel wire were briefly in use (in the 1940's and early 1950's) prior to the advent of reel-to-reel tape. This device was in sad shape when I purchased it, but is now fully functional (it required mechanical and electrical work, as well as restoration of the case). This recorder adds to my small collection of antique audio recording devices and accessories. Click on image at right for video of this wire recorder in action.

original iPhone microphone adapter

iPhone adapter I built this adapter to connect the audio output from a scanner into my iPhone, according to the schematic at right, based on the instructions found at this website. One thing I can do with it is connect it to my radio scanner, and decode aircraft transmissions using Black Cat Systems' ACARS Decoder app. iPhone adapter

Coffee grinder adjustment

delonghi The coarsest setting on our Delonghi coffee grinder was too fine, so (taking a cue from Zheng's blog) I hacked the inner mechanism so that we could achieve the perfect grind. Yes, I voided the warranty, but what's more important - a warranty I'll probably never need, or a good cup of coffee?

Nixie tube tester

nixie 1 Nixie tubes are very cool retro-looking neon-type tubes used in some 1950's and 1960's electronics to display numbers. I salvaged two of these tubes from a multimeter I lost in a major flood at our house in September 2011. I decided to build this box to test the tubes, and to familiarize myself with how they work. The unit runs off a 9 volt battery using a power supply (from a kit I purchased online from LEDsales in Australia) to step the voltage up to 170 volts. The "chicken-head" knob completed the retro look. nixie 2

New workshop

wall We had to gut and rebuid our entire basement, including my workshop, following a flood in 2011. Although it took a lot of time, money and effort, my new bench is a joy to work at. workshop

Message indicator extension

phone mod

My phone has a flashing light to indicate that I have a message, but I couldn't see it from the doorway of my study, so I cut up a length of fiber optic cable into pieces, made it into a bundle, and inserted it into a copper fixture that I painted (well, actually Sharpied) black & affixed to the phone. Voila! Now I can see the flashing light from the doorway, without having to go to the phone to check it :)

SD card to USB adapter

USB adapter 1USB adapter 2

The adapter for my camera card was originally encased in a hideous hinged plastic thing; i decided to extract the innards and encase them in wood instead. Marie suggested the copper side trim to make it look more steam-punk, a fashion we've been intrigued with after seeing the movie Metropolis.

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Last updated 23 January 2018
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