Voltage-controlled current drain (CB9432E)

This circuit was found in a 90's EDN. The load depends on the used transistor.

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Crystal Oscillator (CB5118E)
This circuit can generate signals from 2 to 15 MHz or 4 to 22 MHz depending on the used components...
Locked relay shield (CB8837E)
This interesting configuration was found in a 1965s Electronic Design. It makes use of components of...
Digital potentiometer 4046 (CB25242E)
The figure shows how to obtain a digitally programmed resistance using the 4066. The circuit is...