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Jeff Duntemann's Photos :: Jeff Duntemann's Technology Projects
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 Jeff Duntemann's Technology Projects 

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1964: This is the oldest radio project I still have, and although the photo is recent I built the project in 1964. It's an "all-wave" receiver using a single 6AF11 tube, out of a GE projects book. It was a stupid design and worked poorly, and I was not engineer enough at age 12 to do much to improve it. It was the first radio project I ever built in a chassis.
1964: This is the oldest radio project I still have, and although the photo is recent I built the project in 1964. It's an "all-wave" receiver using a single 6AF11 tube, out of a GE projects book. It was a stupid design and worked poorly, and I was not engineer enough at age 12 to do much to improve it. It was the first radio project I ever built in a chassis.
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Rear view of the 6AF11 all-wave receiver.
Rear view of the 6AF11 all-wave receiver.
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1966: Emily, the Robot with the One-Track Mind, which I built from an article in the March, 1962 Popular Electronics and entered in our 8th grade science fair in 1966.
1966: Emily, the Robot with the One-Track Mind, which I built from an article in the March, 1962 Popular Electronics and entered in our 8th grade science fair in 1966.
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A bottom view of Emily. The project took an immense amount of work on my part, but it functioned perfectly, and to this day the other kids from my class think of me as "the robot guy" 40+ years later.
A bottom view of Emily. The project took an immense amount of work on my part, but it functioned perfectly, and to this day the other kids from my class think of me as "the robot guy" 40+ years later.
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1966: After my folks had the kitchen counter replaced, they gave me the old L-shaped counter and I put legs on it as my first workbench. (I was 13.)  It was always buried under mounds of junk.
1966: After my folks had the kitchen counter replaced, they gave me the old L-shaped counter and I put legs on it as my first workbench. (I was 13.) It was always buried under mounds of junk.
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11/66: I had just completed a square plywood 8" F8 reflector, in the Jean Texereau style. The tube design I cribbed from his book, but the pipe mount was entirely original to me. I replaced the heavy, non-rotatable tube with a length of aluminum vent pipe in 1968.
11/66: I had just completed a square plywood 8" F8 reflector, in the Jean Texereau style. The tube design I cribbed from his book, but the pipe mount was entirely original to me. I replaced the heavy, non-rotatable tube with a length of aluminum vent pipe in 1968.
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5/67: The square scope got a lot of use at my folks' summer place at Third Lake, IL. Not being able to rotate the tube made it difficult to observe certain parts of the sky.
5/67: The square scope got a lot of use at my folks' summer place at Third Lake, IL. Not being able to rotate the tube made it difficult to observe certain parts of the sky.
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1968: This may be the only turn-on-threads Springfield telescope mount in history. (And for a reason, too.) I had no urgent use for the square tube, so I hacked it up into a Springfield configuration, in which the eyepiece never moves.
1968: This may be the only turn-on-threads Springfield telescope mount in history. (And for a reason, too.) I had no urgent use for the square tube, so I hacked it up into a Springfield configuration, in which the eyepiece never moves.
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1968: A close-up of the Springfield mount eyepiece. There's a mirror at the center of the 2" pipe cross, reflecting light up through the eyepiece. The scope was topheavy, wobbly, and almost impossible to balance, but you could look anywhere in the sky without moving your head.
1968: A close-up of the Springfield mount eyepiece. There's a mirror at the center of the 2" pipe cross, reflecting light up through the eyepiece. The scope was topheavy, wobbly, and almost impossible to balance, but you could look anywhere in the sky without moving your head.
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