This circuit is from a 1968 publication. Here we have several types of resistive sensors with individual adjustments triggering a single SCR. Power depends on the type of sound device to be triggered.
This simple intermittent siren circuit was found in a 1989 documentation. Both the intermittent and...
September 2017 - Analog Devices is making available through Mouser Electronics the Analog Devices...
This is one of many possible configurations for this type of oscillator that generates sinusoidal...