5.1 Channel Hi-Fi Amplifier circuit diagram made in USA

Electronics Help Care January 2, 2026 Home theater

5.1 Channel Hi-Fi Amplifier circuit diagram:

This is the 5.1 Channel Hi-Fi Amplifier circuit diagram made in the USA. This circuit is designed for a home theater system, featuring two front speakers, two rear speakers, one center speaker, and one subwoofer speaker. If we use a Dolby input sound card, we can get Dolby surround output. for the surround speaker, LM1875. And for the subwoofer used TDA7294.

The voltage is 18-0-18. and 5 amperes. The audio inputs are separated. The rear and front are stereo. The center and woofer are mono inputs.

The TDA7297 is It is widely used by hobbyists for DIY audio projects because it requires very few external components to operate.

Amplifier Type: Class-AB. Channels: 2 Channel (Stereo). Output Power: 15W + 15W into 8Ω speakers. Operating Voltage: Wide supply range from 6V to 18V (typically used at 12V). Gain: Internally fixed at 32dB. a popular dual-bridge Class-AB audio power amplifier IC specifically designed for consumer electronics like televisions and portable radios.

The LM1875 is a monolithic power amplifier integrated circuit (IC) designed for high-quality consumer audio applications

Output Power: Typically delivers 20W into 4Ω or 8Ω loads with a ±25V supply. It can reach over 30W with a ±30V supply.
Distortion: Extremely low total harmonic distortion (THD), typically 0.015% at 1 kHz and 20W.
Voltage Range: Operates on a wide supply range from 16V to 60V (or ±8V to ±30V).
Gain: High open-loop gain, typically 90 dB.

Speaker protector for 5.1 surround amplifier USA:

This is a Speaker protector for a 5.1 surround amplifier in the USA. This circuit is for speaker protection. 12-0-12 voltage is needed for this circuit. Here has 6 inputs and 6 outputs. 5 inputs and outputs for the speaker and 1 input and output for the bass speaker.