In this circuit, the integrated amplifier used is uncommon today. The circuit is from an American documentation from the 70's making use of a power transistor for output. A TIP32 can be used.
Found in Exar documentation from the 1980s, this circuit has a 60 dB cutoff at 1800 Hz. The...
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The L78xx is equivalent to 78xx...
This circuit was found in an American technical manual from the 1980s. The LM111 is an uncommon...