Raytheon's used integrated circuit is no longer common today. The circuit was obtained in a documentation from the 80's and must be powered by a symmetrical source.
This circuit is from an English magazine of 1977. The circuit is still current, just using a TIP41...
This circuit is from 1993 documentation. The table shows the component values for voltage...
This indicator, shown in the figure and suggested by National Semiconductor, causes an LED to...