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 circuit, from a 1968 Electronics World, is fed directly by the rectified voltage from the...
This 1986 documentation circuit provides 3, 4, 5, 6 V voltages under 350 mA for powering walkmans...
The purpose of this circuit is to restore the 0 V black level of an analog TV video signal at the...