This circuit uses an unusual operational amplifier nowadays and has a very low consumption. The number in parentheses corresponds to the second channel, for a stereo version.
This circuit was found in an Argentine publication from 1973. It uses a common AM coil (50 + 50...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...
We found this circuit in an English publication from 1982. The transistors can be the BC548. We...