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Content 4/4

This is a printed circuit board for the legendary telegraph key design of Ted Theroux N9BQ


Read more at this link: http://dk2jk.darc.de/arduino/keyer/literatur/QST/cmos_keyer_QST_Jun_1982_p26-28_47.pdf


Aug 27,2018
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    • Engineer from INDONESIA
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