This circuit is from the Motorola Linear Databook of 1990 and can be implemented with other operational amplifiers. The power supply must be symmetrical.
The TBA810 integrated circuit used in this 1982 project is not very common today, but if found it...
Based on operational amplifiers of the time, this circuit from the 1980s has high input impedance. The...
Found in a 90s Popular Electronics, this mixer can be expanded to more channels. Transistors can be...