Home  Security Circuits
The Directory of Electronics Circuit
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 | HIGH-POWER ALARM DRIVER
In this circuit, a low-powered SCR is used to trigger a higher powered 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. BZ1 is a high-pow ...
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 | AUTO ALARM
In operation, the alarm circuit allows a 0 - 47 second time delay, as determined by the R1 /C1 combination, after the switch is armed to allow the vehicle's motion sensor to settle down. This allows you time to get a bag ...
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 | HOME SECURITY SYSTEM
This alarm circuit activates when S1 through S5 are activated. This lights LED1 and activates Q1 via IC1C and IC1D. RY1 is wired to self latch. S10 is used to reset. When key switch S1 is activated or when re-entry butto ...
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