We found this mixer in an American documentation. Operational amplifier supports equivalent and changed number of inputs. Power can be between 6 and 12 V.
This circuit is from an old documentation. However, it can be mounted with modern equivalent...
We found this circuit at Modern Electronics in January 1991. The magazine no longer exists, but...
We found this circuit in the Motorola Linear Databook of 1993. It is the traditional configuration with...