We found this circuit in a Radio Electronics from December 1963. The circuit combines valves and transistors and has a high input resistance. The circuit is powered by two batteries.
In the figure we show a timer, which is simpler because it uses only one of the four gates of the...
This receiver can tune in the 3 to 12 MHz band with good sensitivity and selectivity, using a good...
This circuit squares the waveform of a signal applied to its input. The circuit is from an old...