Construct a simple RC high pass filter circuit, using your capacitor ... the comparator output and the LED is used to limit the current through the LED. See Lab Handbook Section 2.3.7(a) LED. Refer to ...

So it’s rare in 2024 to find anyone characterizing a spark gap transmitter, as [Baltic Lab] has. The circuit is simple enough, a high voltage passes through an RC network to a spark gap ...