I’ve been in digital electronics for a while, so I decided to combine my knowledge with analog electronics. This project is a modular amplifier based on LM3886 50W monolithic amplifier from National Semiconductor configured as non-inverting amplifier. The preamplifier and tone control module is based on TDA7313 digital controlled preamplifier via I2C with PIC16F88.

The Amplifier Module

The circuit is based on Jim George Six Channel Mixer and Amplifier configured as non inverting amplifier with a gain of 23.

Tone Control Module

The TDA7313 schematic is based on the datasheet, with the addition of a 7809 regulator. I added the regulator since the other modules are working on different voltage level so any accidental voltage input will not destroy the unit.

Controller Module

The Microcontroller is a PIC16F88 using internal oscillator, with 3 buttons for menu and navigation and a 2×16 LCD for display, like the other module, an onboard regulator is on board.

Actual Modules

LM3886 Amplifier Modules

TDA7313 Tone Control

Microcontroller, LCD and Buttons

Demo Video

Project Files in PDF and hex file for MCU can be downloaded from here

  1. Josh says:

    Where did you source your TDA7XXX chip from? I’m starting a project and haven’t stumbled upon many good sources yet.

  2. lgdumlao says:

    Sir, anong speakers yung gamit mo? Saan ba makakabili ng cheap na full range speakers?

  3. lgdumlao says:

    Salamat sir, saan mo din pala nabili yung tone control IC? Alexan Raon din?

  4. Cris says:

    Can you share your code. I am having trouble in coding TDA7313 (I2C system). Limited lng alam ko sa programming. Maraming salamat. chooper0001 at gmail.com

  5. Stefan says:

    I have a question…this controller will work on any amplifier? It’s programming will affect the volume level? Let’s say that I want to put this controller on a 150 W amplifier,the controller will let me go on full volume or it will be limited by the programming?

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