High gain amplifier stage (CB20561E)

This audio amplifier stage was found in a 1963 publication. The circuit was designed to use germanium transistors. The headphone is 70-ohm.

First IF Amplifier Stage (CB935E)
For reference only, this is the first IF amplifier stage of a common transistor radio from the...
High Input Impedance Amplifier MC1776 (CB4501E)
We found this circuit in the 1993 Motorola Linear Interface ICs. The operational is unusual today, but...
Unijunction monostable (CB5425E)
This circuit was found in an American 1980s documentation. The transistors admit equivalents and the...