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.
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...
This circuit was found in an old American publication. It is valid for any operational. Formulas for...
This frequency corresponds to musical note C3. Frequency accuracy depends on the accuracy of the...