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 timer uses common components today. It activates a relay after intervals that can be adjusted up...
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...
Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the...