This circuit, with printed circuit board, is from an article in Radio Electronics magazine from May 1971. The circuit uses the C106 which was already a common component at the time.
Found in old documentation, this circuit is tuned to pass signals below 245 Hz with a level of...
Mounting an oscilloscope is the dream of many of our Internet users, although it comes up against...
This circuit blocks 60 Hz signals and can be used in filters for audio equipment. The operational...