A quick home made speaker
Here is a quick demo of a home made speaker:
The funnel end of an old vinegar bottle was used. Some magnet wire was wrapped around the end, covered with tape. A small rectangular magnet was taped inside the coil. It does work but not much volume or fidelity (works OK with CW). The SMT version of the Zerobeat kit was included to provide some "motion".
This was recorded on 20 meters, the morning of April 8, 2023.
Best Regards,
Chuck, WB9KZY