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Test Instrumentation Enter Your Electronics & Design Project for a chance to win a Grand Prize for Originality, a Tool Set, and a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Thanks to continuing inspirations from so many of my fellow element 14 members I have launched into a project to build a simple DC Electronic Load. I built an Electronic Load once before on a larger scale as that one would handle up to 6 Amps at 35 VDC. ...
I have recently been helping my friend Judy organize and get her Electronics Parts store back on it's feet. This has meant I get to dig through the old stock and reorganize to my heart's content. As I was sorting packages of capacitors yesterday I came across some with and unexplained coil of what looked like solder. The coil was very tightly wound so that it had the appearance of a small spring 1 cm in length. They looked like this:   At first I thought this was a waste as no one would ...
About a year ago I decided that I would try to write an electronics related book. I had written, in the past, simple articles, a couple small books related to dental medical equipment, blog posts on this forum, and a manual for a desoledring station but never anything that would really qualify as a book. Unlike most of my friends on this forum I am not an engineer. I am a self taught technician so my first thought was, what could I possibly write about the would be of any interest to my engineer ...
Today I pulled an old telephone system out of a store that was no longer using it. The one thing that caught my eye was this Harmer Simmons RD 219 Power Supply. It is a beast of a linear power supply with +/- 24 Volts at 4 amps and 5 Volts at 7 Amps.     Weighing in at 11 kilograms it would probably make a pretty good boat anchor. Here are some internal pictures.         Based on the date codes on the chips this is mid 1980s technology and it was probably ...
For a couple weeks I had been on a roll with respect to leaving the basement door exit to the garage open. My shop is in the basement of my home and there are two ways to get into and out of it. The first way is a doorway and stairs from the kitchen area. The second way is a door and stairway up to the garage. It seems that I have gotten into the habit of going out the door leading to the garage with the intention to return immediately. The door itself has a school lock which automatically locks ...
Today I decided that for the fun of it I would smelt the jars of solder tailings that I have accumulated over the last 4 years. I have been very faithful in collecting the scraps and splatters as well as the solder collected from desoldering and salvaging circuit boards. Not only do I want to be environmentally conscious but I also want to avoid the damage that happens to the floors when solder and scraps of metal get embedded into the wheels of the shop chair.   I began the process by mak ...