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Category: Security Circuits / Surveillance This circuit is also crossed to: Alarm Circuits Views: 4550 Rank: 0 This project is a standalone simple home security monitoring project that will trigger a buzzer when the magnetic contact is opened. visit page.
Related circuits Build Your Own Door Bell Chime using 555 timer integrated circuit, a speaker, 5 resistors, 4 electrolytic capacitors, 1 ceramic capacitor, 3 diodes, 1 pushbutton switch and 9 V battery as power supply. Construct a 6-15V Alarm by using LM/NE 556 dual timers. It will generate a noise level of 90db-110dB range. Construct your own two station Intercom Project. It uses LM386 amplifier. Each intercom station has its own battery, speaker, microphone and amplifer circuit. LDR1, a cadmium sulphide (CDS) photoresistive cell is used as the lower leg of a voltage divider between Vcc and ground. The timer terminals 2 and 6 are connected to the junction of the photocell and SENSITIVITY control Rl. The resistance of the photoresistive cell varies inversely as the light... This bug can be attached to anything from a glider to a pot plant and you can track it with a radio. Why track a pot plant? The Beeper is the result of many requests for a mini tracking device and introduces a new world of tracking. The circuit is very compact and consumes very little power.... This circuit responds to RF signals from below the standard broadcast band to well over 500 MHz, and provides a visual and audible indication when a signal is received. The circuit is designed to receive low-powered signals as well as strong sources of energy by adjusting the bias on the pick-up... CI and LI resonate on the 1750 meter band, with coverage from 150 kHz to 500 kHz. LI can be slug-tuned for 160-to-190 kHz coverage alone or a 2.5 mH choke can be used for LI, if desired, using CI for tuning. A 1N270 germanium diode rectifies the RF signal and C2 is charged at the peak RF level.... Construct your own Electronic Lock by using two dual D flip-flop 4013. Four secret combination of numbers are used to OPEN this combination lock. How To Wire a Series Circuit using Contacts
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