The figure shows how to implement an alarm buzzer in an LM3914 to warn about crossing the scale limit. The circuit can use other types of warning.
This instrument was obtained in a documentation for radio amateurs of 1976. The circuit measures...
This circuit is from the July 1973 Radio Electronics magazine. The circuit is based on the XR-205,...
This circuit was found in a Popular Electronics of the 1990s. The sensor is a rotating mechanical...