Locked relay shield (CB8837E)

This interesting configuration was found in a 1965s Electronic Design. It makes use of components of the time.

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Reflex Test (CB16554E)
This circuit was found in an 1888 publication. However, since it uses common components, it can...
Impedance Match (CB493)
The input impedance of this circuit is about 700 k ohm and the output impedance is about 1 k ohm....
Remote Control Extender (CB26151E)
This circuit appeared in the 1991 Electronics Experimenter Handbook. The circuit is for remote...