Electronic Cw Bug Keyer Circuit

  
This keyer uses skin conductivity to simulate the old-fashioned mechanical CW bug keyer. When the dit paddle is touched the bias on the inverter, ICl-a is shunted to ground, and it produces a logic high, causing oscillator sections CD to generate a low-frequency square wave keying Ql for a series of dits.
Electronic Cw Bug Keyer Circuit - schematic

When the dah paddle is touched, section b produces a logic high, driving keyer Ql on.




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