Found in a Linear Technology documentation from the 1990s, this circuit has the voltage adjusted by resistors R1 and R2 according to the formula given in the diagram.
This circuit was found in an American publication from 1968. The transistors are from the time,...
This preamp with several inputs using germanium transistors from the time was found in Japanese...
This circuit uses two sensors that are placed at the intersection of a miniature railway, causing...