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(2024/7/3 7:06:06)
【回路】Frequency Counter kit from China
(2021/2/4 15:28:58)
【回路：中華カウンタとプリアンプ】
I made a kit for a frequency counter. This kit was purchased by mail order from China. It was only $2.9-.
The frequency counter was lacking in input sensitivity as it is. So I will build a pre-amp to increase the sensitivity. I put an amplifier on it and it started
counting at an input of about 100mV. This is very practical. (2020.07.05 de JA9TTT/1 Takahiro Kato)
execution time : 0.014 sec