This circuit was found in old documentation from Analog Devices. The integrated circuit is from the era. It has two settings and operates at frequencies up to 50 MHz.
We found this circuit in a 1991 publication. It indicates when an analog phone line is busy by...
Found in Motorola documentation from 1967, this circuit shows how it is possible to obtain a...
This circuit was found in a 1995 documentation, eventually requiring two resistors in series with...