Showing posts with label Japan. Show all posts
Showing posts with label Japan. Show all posts
Tuesday, July 28, 2026

Hidehiko JA9MAT's Self-Quenching Super-Regenerative Receiver from Japan -- AI Gets It Wrong!

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Updated image to show quenching Hidehiko reports that in Japan, this is called a "Self Quenching Circuit" and that it is popular w...
3 comments:
Saturday, July 25, 2026

Someone Else Used the FT-101 VFO Box -- JA9MAT in Japan

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Look at that!   The VFO from the venerable (1970s!) Yaesu FT-101 lives on, not only in Northern Virginia, but also in its country of origin,...
4 comments:
Thursday, July 23, 2026

A Homebrew Receiver from Hidehiko JA9MAT

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We recently complained that no SolderSmoke Direct Conversion receivers have been built in Japan.  So far, no Japanese SS DC Receivers have b...
2 comments:
Tuesday, July 7, 2026

Shuji Nakamura -- Inventor of Blue LEDs -- Takes on Fusion Energy at Age 72

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This blog covered Shuji Nakamura at least twice before -- we reported on on how he had invented the blue LED:  https://soldersmoke.blogspot....
1 comment:
Sunday, July 5, 2026

An Interesting Receiver from North Macedonia

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https://hackaday.com/2026/07/02/diy-si5351-radio-tunes-in-sw-mw-and-more/ There are some really cool features in this receiver:  There is an...
2 comments:
Tuesday, August 19, 2025

Coil-Making in Japan -- Manual and Automatic

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  I found this video sort of soothing.  I liked the manual process, but the automatic process is amazing too.  Thanks to Rogier PA1ZZ for se...
5 comments:
Friday, November 22, 2024

Tezukuri and Chappy Happy -- Amazing Videos on Homebrew Radio (from Japan?) - Another 40 Meter Direct Conversion Receiver

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So around the time we were building 40 meter direct conversion receivers, someone else was doing something similar.  His product (above) is ...
4 comments:
Saturday, September 7, 2024

Sony and the Transistor

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  https://www.youtube.com/watch?v=7pi9k5n7Wrw I found the comment about Sony's belief that NPN transistors are superior to PNP very in...
1 comment:
Tuesday, June 18, 2024

Amazing Homebrew from Japan -- 7L4WVU's All Homebrew Station

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Thanks to Roy WN3F for alerting me to this.  Tadashi-san has really built some beautiful stuff.  Especially impressive to me is his use of t...
1 comment:
Friday, February 16, 2024

Shuji Nakamora and his (Juliano) Blue Gallium Nitride LED

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Lots of great stuff in this video:   -- They get the charge carrier thing right:  contrary to many presentations, holes don't really mov...
1 comment:
Monday, January 15, 2024

Clock Chimes from Japan - Contact with JA0LBE

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This contact with Masa was a lot of fun.  2300Z January 14, 2024.  15 meters was obviously in great shape.  Suddenly I started hearing clock...
1 comment: