We found this good amplifier in a Japanese publication of 1966. Transformers are uncommon nowadays and the power supply is included. Power is a few watts.
We found this circuit in a 1998 documentation. The circuit makes use of CMOS logic and must be...
Suggested by Siliconix in documentation from the 90s, this amplifier has its gain digitally...
Found in an old American publication, this is one of many possible configurations for an analog...