This circuit is from a Radio Electronics magazine from August 1990. The circuit uses components from the time and is suitable for measurements in alternating current.
This time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The...
This telegraph microtransmitter for a frequency determined by the coil and the crystal was found...
This digital to analog converter circuit was found in the July 1991 issue of Radio Electronics magazine....