Approved by the FCC, this circuit was found in documentation from the 1980s. The circuit uses an unusual component today.
This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the...
This circuit, found in a 1986 documentation, uses an optical sensor to count pulses and, in its...
This circuit is used to test capacitors with a working voltage above 150 V, detecting shorts or...