Photo : 2021.07.05 17:25 JST at "Honjo General Park" Honjo-City

Photo : 2021.11.14 16:11 JST at "Honjo General Park" Honjo-City.

Photo : 2021.10.15 13:51 JST at Mt.Azumakofuji Bandai-Asahi National Park.

  Photo : 2021.09.15 08:45 JST at our Garden

 Photo : 2021.09.05 13:13 JST at our Garden（ヤマトシジミは夏型♂らしい）

Photo : 2021.07.21 12:48 JST at "Imori Pond" Myoko Highland

【測定：簡単カーブトレーサ・アダプタの試作法】 abstract This Blog explains how to make a simple curve tracer adapter. This curve tracer adapter was designed in the 1970s. So, there is no IC in it. Instead, this is a very good use of UJT. The circuit is simple, but I think it still works well today. I also dealt with how to modify the cheap oscilloscope, which is an essential part of the curve tracer. Even a

【DDS：AD9833を使ったDDSモジュールのススメ】 abstract Try the DDS module using the AD9833. I bought this DDS module from a mail order company in China. It is very inexpensive, but the performance is good. The signal obtained by this DDS module has good frequency accuracy and the spectrum of the signal is clean. I would like to explore the basic use of the DDS module first. (2020.12.15 de JA9TTT/1 Takahiro Kato)

【ECL ICを使ったRF-PSNの製作】   I use the ECL of a fast logic IC to make the 90° phase shifter needed to generate a PSN type SSB.　It didn't work properly at first because it was built on the breadboard. Even though it was a logic IC, it was accompanied by an oscillation phenomenon. The cause was unexpectedly simple, ECL-IC is an internal structure like an analog IC.    It's like a series of

【回路検討：ゲルトラで作るパワー・アンプ】 abstract Making an RF Power Amplifier with Germanium Transistors. Germanium transistors are vulnerable to high temperatures, so they are mounted on a large heat sink.　The Π605 is made in the Soviet Union, so I had to make a little effort to mount it on a heat sink. Now that it went well, let's try a collector grounded type RF Power Amplifier. (2020.11.30 de JA9TTT/1