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Test Equipment
IFR 1200 SS Cushman CE-5 Airwave Inc.

I am no longer active in this hobby for the foreseeable future. 
I will no longer maintain or update the website, but I will leave it accessible to the web for as long as possible (years).


IFR 1200 SS
Cushman CE-5
Airwave Inc.

My Collection
Test Equipment
Model Rocketry

Bryan's Old Computers

Yet Another Hobby...

I like test equipment (shiny objects and flashing lights). It's another geek thing--but with a whole different set of geeks. :)

Back in the seventies, when I was a poor teenager and had to find my test equipment without the help of ebay, I often had to resort to building it myself. Money was tight, and good test equipment was very expensive. I ended up making much of my own for fun and actual use. I built a lot of simple things, logic probes, power supplies, semiconductor testers and curve tracers, & etc.

One time I made a frequency counter in a probe--about the size of a logic probe. To get it that small, all the chips were stacked like bricks, with the pins bent outward, cut short and soldered point-to-point with wire wrap wire. What a pain! It worked for a long time, but somehow I blew a chip in the front end and the pain of replacing it was just too much. It was cannibalized somewhat, and then discarded. I had big plans of starting a business to sell them, but it was just too much trouble for a dumb high school kid.

My 'Frequency Probe' case design, 1978

My most ambitious project at the time was a 41/2-digit digital voltmeter of my own design. It used a dual slope analog to digital converter that I had to learn about in order to build. It took months to complete, but worked fantastically! I even added a capacitance, current, and ohms function. I used it for years, and then like most of my projects, cannibalized it for parts to build something else. Today, nothing remains but a few of the precision resistors I used in the voltage divider. -- My interest in preserving history is a recent one. :)

Check the above links to see my test equipment related projects.


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Copyright 2008 Bryan's Old Computers
Last modified:
October 16, 2009