Semi-Automatic Keyer

This circuit was found in the RCA Hobby Circuit Manual, 1970. It's only right that a keyer built with descrete parts, rather than integrated circuits, be included with the other keyers. This particular keyer emulates a "Bug", or manual Semi-Automatic Key. Normally with a "Bug", Dots are formed with a vibrating arm, and the Dashes are formed manually. This keyer operates in a similar manner.

The Semi-Automatic Morse-code keyer or "bug" generates a single dot or a series of dots, depending upon how long the paddle-key is depressed; the dash must be made manually. The rate at which dots are generated can be varied.

PNP 2N1305, General purpose amplifier, high freq. for computer & switching applications TO-5 2N1284, 2SB39, ECG158, HEP629, SK3005 276-2007

NPN 2N2484, Low level, low noise, high gain TO-18 2N957, 2SC17, 2SC68, ECG123A, HEP50, SK3020 276-2010

SK3030 comes out to a 1A 600v diode according to the same place.

Automatic Keyer