Marc Vaillant's Page

" Here is another interesting low cost circuit that might work well for an audio derived CW RIG Keying circuit: FROM:  https://web.eecs.umich.edu/~prabal/pubs/papers/kuo10hijack-islped.pdf"

"Here is a LIVE DEMO of using the full wave doubler circuit with a MOUSER 8 ohm to 200 ohm input transformer - this is a REMOTE CW setup, where a Low Power AM transmitter(1630 Khz) is modulated at the remote OP's desktop by the audio output of a…"

"Here is a video demo of testing these kind of circuits to key CW on a RIG to find the "best" audio pitch AUDIO DERIVED CW KEYING CIRCUIT - (what audio frequency to use) Finding the "best" audio pitch to generate the most…"