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5.1 Channel audio preamplifier

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 preamplifier consists of six TL074/TL072 preamplifier stages and PT2258 electronic volume control. The input stage of this preamplifier consists of six TL074/TL072 buffer stages. The PIC16F886 microcontroller manages the PT2258 electronic volume control IC. All the volume levels and menu options are displayed on HD44780, 16x2 character LCD screen. This video shows all the steps of this project including, soldering, wiring, and menu system of the preamplifier. Additional details and all the project files including, firmware, are available at http://jayakody2000lk.blogspot.com/20.... Content of the video: 00:00 - 5.1 channel preamplifier PCB 00:08 - Soldering PIC16F886 microcontroller 00:27 - Soldering TL074 and TL072 opamp ICs 01:55 - Soldering SMD resistors... 02:39 - Soldering SMD capacitors... 03:18 - Soldering BSS138 and BC817 transistors... 03:44 - Soldering SMD electrolytic capacitors 04:40 - Installing ground isolation jumpers 04:52 - Soldering through-hole type resistors 05:08 - Soldering through-hole type capacitors 05:15 - Soldering 50K trimpot 05:30 - Soldering the bridge rectifier 05:41 - Installing connectors and pin-headers 05:48 - Soldering filter capacitors 06:08 - Making the heatsink 07:02 - Soldering PT2258 IC/socket 07:20 - Preparing the ABS project box 09:28 - Attaching audio input cables to the PCB 09:37 - Attaching audio output cables to the PCB 10:30 - Connecting the 6V transformer to the PCB 10:45 - Mounting transformer and PCB into the box 10:58 - Installing 3.5mm stereo jack sockets 11:15 - Preparing EC11 rotary encoder... 11:29 - Preparing the push switch 11:37 - Connecting AC mains cable 12:14 - Mounting LCD, EC11 rotary encoder, and push switch 13:02 - Building and uploading the firmware 13:58 - Menu system and volume control modes 14:19 - Custom profile mode 15:29 - Reset to default (automatic) volume mode