This sophisticated audio generator with digital display was found in the March 1984 issue of Radio Electronics magazine. The circuit includes a power supply with various voltages.
This type of sensor was used in sensitive infrared systems from the 1960s. This circuit was found...
Maxim MAX20416 Step Down Converters Available through Mouser Electronics these 2.2 MHz converters feature...
This “one channel” demonstration circuit was found in the April 1979 issue of Radio Electronics magazine....