STOPPING_PADDLE_BOUNCE

Published:2009/7/11 4:01:00 Author:May | From:SeekIC

Simple circuit prevents generation of erroneous dots by paddle contact bounce in keyers having dot memory. Uses 74121 mono MVBR and 7432 AND gate. Output of 74121 stays low if paddle is not in use or if dots or dashes are being sent. Release of dash paddle makes 74121 transmit high-level pulse to AND gate, long enough to block dot caused by bounce. Suitable only for keyers using +5 V.-B. Locher, Keyer Modifi-cation, Ham Radio, Aug. 1976, p 80.



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