This circuit, which can be used to indicate the movement of an object, was found in NASA documentation. The circuit uses a sensor made with liquid in a container as shown in the figure.
This circuit, found in a 1994 publication, allows the use of two common analog telephone sets on a...
This 1967 General Electric circuit makes use of an array of 3 (integrated) transistors for an...
This modulator circuit for low intensity signals is from old documentation. The integrated circuit...