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Ideas/Tips/Inspiration

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Custom Markings for Project Panels

It seems there is no one good way to label our project enclosures based on the many different material types, colors, and surface finishes to be found out there. This article will discuss some of the methods that I’ve employed and will point out the pros and cons of each method.

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An Altair Clone: Then and Now

When I read the article “Build a Pocket-Sized Altair Computer” by David Hunter on building an Altair clone, I was reminded that I too had designed an Altair clone, but I built mine in 1977. Mine required seven boards in a 19” rack. This article details the resources I had then in a comparison of what resources are available today. I’ll also describe how I designed and built my clone.

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Can’t Keyboard? Use Morse Code Instead

A few months ago, I accepted a challenge: Design a way for people who can’t easily use a keyboard to create text for applications such as Word, OpenOffice, eBay, or Google via Morse code. It takes only two fingers to create them, and learning to send Morse code proves easier than learning to receive it, which requires much practice. See how I used a $10 Cypress Semiconductor CY8CKIT-059 MCU board to mimic a USB keyboard but without software drivers, code libraries, or special USB-interface ICs.

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Transformer Based Power for Nixies

Nixies were introduced when vacuum tube hardware automatically provided the high voltage they require. These days, circuitry typically runs on five volts or less, so finding the +170V or so for Nixie anodes can be a bit of a challenge. Here are three transformer based ways to obtain that high voltage in line-powered semiconductor-based devices.

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An Easy CATV Coax Antenna

A few years ago, we brought you a story about a guy building ham radio antennas from aluminum crutches. Now, he's using cable TV coax for his dipoles.

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Static Discharge Helps “Cure” Audio Amplifier

After trying different things to troubleshoot an intermittent problem with my MicroBITX kit (multi-band, software-defined ham radio transceiver), it turned out static discharge was the answer to my problems

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Battery Pack Failure Modes I Have Known

Keeping your batteries ready for action in your ham radio hobby is something we all have to deal with. How much does “memory effect” come into play with recharging? Does it really exist? Let’s look at some different failure modes and what might really be behind them.

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