This transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of the 90s. The circuit has a power of ½ W.
This circuit was obtained in a 1982 magazine. In it we have the way to connect two integrated...
This circuit (2009) has driver control through the RTS signal or in automatic mode through the...
This shield circuit was obtained from Radio Electronics magazine, July 1990. The triac is load and...