An important possibility of use for an SCR is to trigger a relay that will be connected to the horn or a siren in an automobile. The activation switch in the case will be installed on the vehicle door, and the one that activates the internal lights can be used, by switching on the panel. When the door is the same. Even after closing the door quickly, the horn will still sound. To turn the alarm off, there must be a secret switch that will turn off the circuit power. One of the advantages of this type of circuit is that its current consumption in the standby situation is practically zero, therefore, the battery will not wear out, even keeping it on all night.
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