Drinking Water Alarm Sensor Using LM555

This is a design circuit for fabricating this water sensor, you need two foils an aluminum foil and a plastic foil. You can assemble the sensor by rolling aluminum and plastic foils in the shape of a concentric cylinder. Here’s the figure of the circuit;

In this situation, this water alarm circuit will save the people from long wait as it will inform them as soon as the water supply starts. At the heart of this circuit is a small water sensor.  Component: LM555 IC, Resistor, Switch Capacitor, Speaker. [extremecircuit.com]

Anti-Theft Security For Car Audios CD4093 IC

This is a design circuit for security. This is the figure of the circuit;

This circuit can be effectively used for protecting your expensive car audio system against theft. And it based on popular CMOS NAND chip CD4093. Component: CD4093 IC, Resistor, Transitor, Capacitor, Diode.