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 was obtained in a Popular Electronics of 1991. The magazine no longer exists, but the...
With this voltage regulator we can have currents up to 4 A at a 5 V output for TTL circuit power. The...
This circuit was found in February 1976, Radio Electronics magazine. The circuit is quite...