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.
What this circuit does is to stretch a pulse, increasing its duration. The integrated circuit is...
This circuit is designed to measure very weak currents, in the order of picoamperes. We found it...
Found in an American documentation from the 90s, this circuit uses small low voltage lamps (6 to...