This is one of the many possible siren configurations for the 555 integrated circuit. We found it in the October 1992 Radio Electronics magazine. It has a power stage.
This control for 1200 W of power was found in the documentation of General Electric of 1966 has a...
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...
This circuit has a monostable action with time given by the capacitor. The bipolar transistor can...