This is a two-input audio switching circuit. The operational can be of any type and more entries can be added. The power supply must be symmetrical.
We found this interesting configuration in a 1976 technical documentation. Equivalent diodes can...
Indicated by the Maxim Engineering Journal in the 90's edition, this circuit uses only one...
The gain of this circuit is given by the value of R1 that depends on the current in the...