This electronic Morse Key for telegraph message transmission was found in an American 1980s amateur radio documentation. The circuit uses TTL technology and must be powered by a 5V voltage.
The basis of this circuit is 1/4 of a 4136 integrated circuit which consists of a quadruple 741....
This circuit is from a 1976 documentation. The diodes can be 1N34 or equivalent, and the power...
This circuit was found in the October 1987 Radio Electronics magazine. The circuit is a PWM...