This circuit is from an Electronics World of 1967. The described calculations can be applied to equivalent circuits with modern transistors.
This circuit is a four-quadrant multiplier using an LM3900. The circuit was found in the July 1988...
This circuit was obtained in an old Linear Technology documentation by applying to the monitoring of...
July 2017 - The new touch switches from Alps SKPS series for surface mounting can now be purchased from...