This circuit for the 40 MHz band was published in Radio Electronics magazine in December 1957. Its purpose was to monitor the signals of the Russian satellite launched at the time.
This low frequency doubler requires a 50 mV signal at the input. The circuit is from an old...
We found this circuit in GE's 1977 transistors manual. Transistors admit equivalents according to the...
This transistor tester circuit has the advantage of using a constant current source in the tests....