The circuit shown is used to reset TTL logic when power is established. The circuit uses a 7413 and must be powered by 5 V. The circuit can be adapted to work with microcontrolled applications.
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...