Dilshan R Jayakody’s Web Log

This article introduces high quality digitally controlled 2.1 channel analog audio power amplifier system. This project is mainly based on TDA7377 AF power amplifier and PIC18F452 8bit microcontroller. Basic features of this receiver are 2 × 6W + 20W audio output power, ±14dB bass and treble controls, fully configurable +35dB bass booster for sub-woofer and satellite speakers and loudness switch. This system use commonly available electronic components and all the integrated circuits are in DIL packages. This amplifier consists with few UI elements such as 2 push buttons and 1 rotary encoder. All the menu navigation can perform through rotary encoder. Prototype version of 2.1 channel audio power amplifier project Entire amplifier can build on 147mm × 80mm PCB and all the PCB design files are available to download at google drive . This is an open hardware project and all the firmware source codes, design files are covered with Mozilla Public License version 2.0 . All the ab...

This post show completed view of digitally controlled audio power amplifier with virtual surround (which we described in previous post). All the speaker enclosures, power amplifier casing and electronic system are design and developed by us. Configuration of this given step is as follows: System Components: Power Amplifier, 2 main speaker units, 1 sub-woofer and 18V (5A) SMPS. Speaker System: Main speaker system consist with 8Ω (45W) 6½ inch Woofer, 8Ω (50W) 3 inch Tweeter with passive crossover. Subwoofer System: 3Ω (200W) 8 inch Bass Woofer. All the speaker enclosures are mad out of 9mm MDF (medium density fiberboards) and power amplifier casing is made using 2mm acrylic sheets. More views of this audio system are available in here .