Touch the sensor ... the alarm circuit is enabled by T1 and T2. Transistors T3and T4 form a complimentary pair amplifier, with positive feedback (regeneration) provided to the base of first transistor ...

Simple Sound ... As the circuit has no critical adjustment points it is immediately ready for real-world applications. The acoustic sensor in the circuit is a standard omni-directional foil electret ...

But Ring Alarm is intended as a simple do ... loud beeping sound, and if you are signed up for professional monitoring, authorities will be notified. Ring Alarm supports a sensor bypass mode ...

Sold in various sizes, these systems include devices like door and window sensors, motion detectors and keypads, plus alarm sirens, a sensor that ... Alarm is a security simple that’s as simple ...