Explorer for all ranges (T1098E)

This circuit was found in a Radio Craft from October 1946. Power supply not shown, and tubes are 1.5V filament types.

Economic Timer (CB16468E)
This timer uses common components today. It activates a relay after intervals that can be adjusted up...
AD7779 24-bit ADC Simultaneous Sampling (COM116E)
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...
Battery Saver (CB7134E)
Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the...