nobcha23 https://blog.hatena.ne.jp/nobcha23/ nobcha23のエアバンド受信機自作ブログ DIY airband receiver BLOG https://nobcha23.hatenadiary.com/ R80エアバンドレシーバーキット After FM62429 variable attenuator the audio signal is going to LM386 amp.The same signal is going to the MC3661 filter amp and detector. MC3361 is naturally the FM receiver IC and this receiver is using filter amp for detected signal AMP to open the channel when the signal detects. I'm somehow wonde… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnobcha23.hatenadiary.com%2Fentry%2F2021%2F09%2F29%2F194316" title="Studying R80 circuit diagram PART5 Squelch and audio circuit　 R80回路図の研究 その5 スケルチ、音声増幅回路 - nobcha23のエアバンド受信機自作ブログ DIY airband receiver BLOG" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2021-09-29 19:43:16 rich https://nobcha23.hatenadiary.com/entry/2021/09/29/194316 1.0 100%