
Simple Knock Alarm With Piezo Sensor

Electronic Circuits, Tutorials & Projects
This circuit can be built from readily available low-cost components. The indicated value of 22 Ω ...Read more »
How often on average do you have to call members of your family each day to tell them that dinner ...Read more »
The alarm may be used for a variety of applications, such as frost monitor, room temperature monit...Read more »
Most darkness activated alarms employ op-amps and some logic ICs. Here, a less expensive approach ...Read more »
Short circuits in the tracks, points or wiring are almost inevitable when building or operating a ...Read more »
This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointe...Read more »
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