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This project introduces a digitally controlled 5.1 channel audio preamplifier system. This amplifier is specifically designed to increase the gain of the multi-channel PC sound cards.

This design consists of six TL074/TL072 preamplifiers, PT2258 electronic volume control, and PIC16F886 control circuit.

• Bill of materials
• Printed circuit board
• Schematic of the audio preamplifier
• Soldering and assembling
• Wiring layouts
• Firmware
• License

All the content of this document is licensed under a Creative Commons Attribution 4.0 International License.