This circuit was found in an American documentation from 1968. The circuit uses transistors from that time. The output currents are shown in the diagram.
This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time....
We obtained this circuit from a 1993 documentation. The circuit has 9 current ranges that are...
In the figure we have the transmitter of a data transmission system with optical fiber suggested by...