This circuit for audio applications was found in an English magazine from the 80's. The circuit has a pass band below 3 kHz making it ideal for telecom applications.
We found this circuit in an American 80's documentation. The circuit can be adapted to function as a...
Found in a 1964 Electronic Design, this circuit makes use of FETs of the time. These transistors can...
We found this circuit at Modern Electronics in January 1991. The magazine no longer exists, but...