Power failure alarm

Construct universal power supplies, including low-voltage power supplies for operating electronic equipment. The designs include single- and dual-voltage regulated supplies, an all-purpose adjustable version, and battery pack regulators. A helium-neon laser tube requires a high-voltage power supply for operation....

The amplifier is based on the commonly used class-AB complementary power amplifier with compound pair output transistors. The system uses a TL074 quad opamp to drive the output transistors. As can be seen from figure 1, A2 is used to...

This two-zone alarm features automatic exit, entry, and siren cut-off timers. It was developed for the Beginner's Guide to CMOS Timers, providing a particularly detailed circuit description. An optional One-Time-Only module is available, which will deactivate the siren after...

The Cockcroft-Walton multiplier employs a series of diodes and capacitors arranged in a cascade to generate a high-voltage DC potential from an AC input. This circuit topology utilizes diodes to charge capacitors in parallel and discharge them in series....

When the resistance value of temperature, light, pressure, or any other resistive sensors (Rs) drops below a certain threshold, which can be adjusted by a preset. In electronic circuits, resistive sensors such as thermistors, photoresistors, and piezoresistors are commonly used...

A variable power supply designed for laboratory use. It utilizes two integrated circuits (ICs) to provide adjustable output voltage and current. This variable power supply is engineered to meet the diverse needs of laboratory applications, offering flexibility in output voltage...