We found this circuit in a 1964 Electronic Design. It provides 0.5 V signals from 4 kHz subcarriers. Transistors are from the era.
This control for motors up to 1.5 A was found in the SGS manual of linear integrated circuits. The...
This circuit inverts the signal of any logic using a general purpose PNP transistor. The supply...
This configuration applies to other operational amplifiers in the same family. The circuit was found...