This time base circuit for the oscilloscope was obtained from an Electronics Now from the 90s. The circuit is intended to control the cathode ray tube of old oscilloscopes.
Today we have more compact solutions. This is from a Radio Electronics magazine from October 1990....
This filter was found in Texas Instruments documentation from the 1980s. The circuit uses a common...
16 commercial test circuit for tubes and transistors appeared in Radio Electronics magazine in...