High power alarm driver electronic project

A very simple high power alarm driver electronic project can be designed using this circuit diagram . This high power alarm driver electronic project is based on low power SCR which trigger a high power SCR .

When a switch is opening (S2,S3,S4) or closing (S5,S6, S7) , either SCR1 or SCR2 triggers . This triggers SCR3 via D1 , D2 , and R5 . When the alarm is active the BZ1 buzzer will sound continuously , until the S1 reset switch is preset .
This electronic circuit require few electronic components and must be powered from a dc power supply circuit , that will provide an output voltage between 6 and 12 volt .