Modern Spark Gap Transmitter Uses a Rotary Gap

In the “don’t try this at home” category, [Joe Smith] builds a spark gap transmitter with a twist. The twist is that the drive power is from a signal generator attached to a FET. From there, though, things go classic using an automotive ignition coil and a tank circuit. He shows how adjusting the spark frequency changes the signal’s sound in a standard receiver.


This is a companion discussion topic for the original entry at https://hackaday.com/2023/12/11/modern-spark-gap-transmitter-uses-a-rotary-gap/