5v usb power supply circuit

This laser door alarm operates by detecting the interruption of a laser beam. A low-cost laser pointer serves as the light source. When an individual crosses the path of the laser beam, it triggers the alarm. The laser door alarm...

A USB-powered laptop FM transmitter designed for home theater systems and other woofers equipped with FM receivers. It transmits music from a laptop to the sound system in a room. The USB-powered laptop FM transmitter operates by converting audio signals...

This pager allows the use of in-house phone wiring as a public address (PA) system. It utilizes two tone decoders to detect a specific touch-tone key, which activates an audio amplifier. The described system integrates existing telephone wiring to function...

T1 steps down AC voltage from 115VAC (or 220VAC) to about 8VAC and is then rectified via bridge rectifier BR1 to about 11.52Vdc. C1 filters off the AC ripple. If you find the circuit output too noisy add another...

Bridge rectifier circuit in the electronic ballast application circuit The bridge rectifier circuit is a crucial component in electronic ballast applications, primarily utilized for converting alternating current (AC) to direct current (DC). This conversion is essential for powering various electronic...

Another unit of graphic equalizer with five bands. The primary distinction from other circuits is the use of transistors instead of integrated circuits (ICs), and the power supply operates at +/- 24V DC, which ensures low distortion and greater...