This circuit simulates an American siren and can be found elsewhere on this website and section. The circuit is from a 90s documentation. Preferably, the signal should be applied to an amplifier.
This is stage is transformer coupled and was found in na old publication of the year 1958. The...
This circuit is from the magazine 73, for radio amateurs, from the 80s. The circuit uses common...
This indicator circuit used and game machines (arcades) to indicate that the machine is being...