The DIY AC voltage detector module is powered by a 9V battery, which then is ready to detect any AC voltage. The module and the antenna are moved along the live wire and it can be seen that the LED ...

What is a Non-contact AC voltage detector? It is an AC voltage detector, that can be used to test live wires without any connection, hence the name. Therefore, it is safer than the neon screwdriver ...

This is a CMOS IC (CD4033) based contactless AC mains voltage detector circuit which can be used to detect presence of AC mains voltage without any electrical contact with the conductor carrying AC ...

When working around mains voltages, it can be useful to know whether a given circuit is live or not. While this can be done by direct connection with a multimeter, non-contact methods are available ...

Motion sensor circuits are there on the Internet for quite a while now. These circuits are mainly used to drive AC load (like lights, fans) in home automation or IoT projects. It is also very common ...

The circuit in Figure 1 provides a low-cost, isolated ac-line monitor that measures ac-line-voltage level and has some other unique capabilities. The analysis of the circuit is straightforward: When ...

This file type includes high-resolution graphics and schematics when applicable. For applications such as motor control or power supplies, it’s often necessary to know whether the ac line is at 120 V ...

Overvoltage protection of AC power lines is a common practice, which encompasses a variety of protection circuit solutions. Most designs are cost-driven and tend to use only the bare minimum of ...

Alarm system designs often require circuitry that can detect whether a phone line is active or broken. With this type of design, the primary difficulty is drawing less than 5 µA from the phone line ...