Line-operated-amplifier

Description: T1 isolates the unit from the line and has a 24-V, center-tapped secondary. The output of the transformer is rectified by diodes D1 and D2 and filtered by capacitor C3 to provide 15 to 18 Vdc. The LM383 has built-in protection against speaker shorts.

The circuit features a transformer (T1) that serves the crucial function of isolating the entire unit from the mains supply, enhancing safety and reducing noise. The transformer is designed with a center-tapped secondary winding that outputs 24 V AC. This voltage is subsequently processed through a rectification stage involving two diodes, D1 and D2, configured in a full-wave rectifier arrangement. This configuration efficiently converts the AC voltage from the transformer into a pulsating DC voltage.

Following rectification, the output is smoothed using a filter capacitor, C3, which helps to reduce ripple and provides a more stable DC voltage. The output voltage is regulated to a range of 15 to 18 V DC, making it suitable for powering various electronic components or circuits that require a stable voltage supply.

In addition to the power supply functionality, the circuit incorporates an LM383 voltage regulator, which is notable for its built-in protection features. This regulator is specifically designed to safeguard connected speakers from short circuits, ensuring reliable operation and preventing damage to both the amplifier and the speakers. The combination of the transformer, rectification stage, filtering capacitor, and the LM383 voltage regulator creates a robust power supply system that is both efficient and protective, suitable for a wide array of audio applications.T1 isolates the unit from the line, and has a 24-V, center-tapped secondary. The output of the transformer is rectified by diodes D1 and D2 and filtered by capacitor C3 to provide 15 to 18 Vdc. The LM383 has built -in protection against speaker shorts.