This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of components of the era, but modern equivalents can be used.
This circuit was found in an Analog Devices publication from the 1990s. The circuit performs input...
A modulated (intermittent) siren, using the four gates of integrated circuit 4001 is shown in...
This circuit indicates the logic level of a digital signal. LEDs can replace the lamp, wired with...