Dome shaped homes use cellular concrete 20% with 80% air, which makes it a good insulator. In the Pine Ridge Reservation in S. Dakota. They founded “In Our Hands” non-profit. Short video. https://www.facebook.com/reel/1889790898142946?mibextid=9drbnH&s=yWDuG2&fs=e
Archive for the ‘Do It Yourself’ Category:
2024-02-21 Website for Electronics – Very Comprehensive
This very comprehensive electronics website has many projects with useful devices. This example project is a transistor curve tracer. Go to the index and look at the many, many links. It seems to be at the ETH in Switzerland but some of the words are in ?Thai? https://www.changpuak.ch/electronics/Curve_Tracer_advanced.php#
2024-02-17 BJT, FET Curve Tracer
This very comprehensive website has a transistor and FET Curve tracer. Also a simpler curve tracer for all components. Click on box to download the schematic, etc. https://www.changpuak.ch/electronics/Curve_Tracer_advanced.php#
2024-02-16 Climate Scientist’s Victory Against Climate Deniers
Michael Mann’s lawsuit victory over a million dollars in damages. https://www.nature.com/articles/d41586-024-00396-y
2024-02-11 Calculations: Ferrite Loopstick for a Crystal Set
I think this came from a crystal set made in Japan during the mid-20th century. It has a ball on the end of the ferrite rod like the crystal sets that were shaped like a rocket and this ball was at the rocket’s nose. The coil measures 38 to 380 microhenrys depending on the position
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2023-12-07 Halfsterisk Symbol
I had to use white on black background; it should be black on a white background, like paper.
2023-11-14 My Supercharged Joule Thief At Devopedia
He uses my SJT circuit in his web page. https://devopedia.org/joule-thief-circuit
2023-11-12 Knee High Bench Or Seat I Built
I made it out of an Ikea drawer that someone broke up and threw away. A little over 16″ high. The seat is the front of the drawer, about 9″ wide and 16″ long. Mostly a charcoal color. Took a few hours; I probably spent an hour finding the right pieces and pulling the screws
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2023-11-06 Reproduction Antique Radio Tubes and sets
I’ve been discussing the restoration of a hundred y.o. radio, and I thought about the retro light bulbs that look like incandescents but use LED filaments. Someone should make some old tubes that are actually using LEDs that look like the filaments, but just for decorative purposes. The glass envelope would look like the tube;
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