nobcha23 https://blog.hatena.ne.jp/nobcha23/ nobcha's Radio DIY Lab (Si4732,Si5351a, ESP32, RP2040 & RF Circuits) https://hrd-737.hateblo.jp/ Arduino LC meter First I bought an ATU-100 antenna tuner parts kit and assembled it. The surface-mount components were pre-soldered to the printed circuit board, so assembly required winding the toroidal core and soldering the DIP components.The coil winding involves winding a specified wire around a specified core … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhrd-737.hateblo.jp%2Fentry%2F2025%2F11%2F03%2F002202" title="LC Meter Prototype - nobcha&#39;s Radio DIY Lab (Si4732,Si5351a, ESP32, RP2040 &amp; RF Circuits)" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn-ak.f.st-hatena.com/images/fotolife/n/nobcha23/20250623/20250623195514.jpg Hatena Blog https://hatena.blog 2025-11-03 00:22:02 rich https://hrd-737.hateblo.jp/entry/2025/11/03/002202 1.0 100%