Taking an example of a Raytheon operative as uncommon today, the circuit applies to other operational amplifiers. The formulas are given next to the diagram.
In the figure we have a simple amplifier stage for BC547 series transistors. The gain is...
Found in a 1980s American documentation, this circuit can use a SCR and a general-purpose transistor....
This circuit was found in a 1973 publication. The operational ones can be exchanged for...