6-channel stereo speaker selector 

This project is a DIY six-channel stereo speaker selector based on STC15W201 MCU. The purpose of this electronic switch is to share a pair of speakers between six stereo audio systems.
To select each speaker channel, this circuit uses a couple of 12V DPDT relays. These relays interface to 74HC595 through a ULN2001D, 3-channel Darlington transistor array IC.
Additional information on this project, including the schematic, PCB layouts, and compiled firmware files is available at jayakody2000lk.blogspot.com/20....
The PCBWay sponsored this project. The six-channel stereo speaker selector PCB is available to order from PCBWay: www.pcbway.com/project/sharep...
Content of the video:
00:00 - 6-channel speaker selector PCB
00:10 - Soldering STC15W201S MCU
01:00 - Soldering 74HC595 ICs
03:10 - Soldering ULN2001D ICs
07:14 - Soldering SMD resistors
07:46 - Soldering SMD capacitors
08:54 - Soldering resistor networks
09:52 - Soldering LM1117-5.0/AMS1117-5.0 voltage regulator
10:09 - Soldering JST connectors
10:26 - Soldering electrolytic capacitors
10:33 - Soldering screw terminals
11:37 - Soldering 12V DPDT relays
12:09 - Soldering ISP header terminal
12:16 - Installing PCB into the enclosure
12:51 - Connecting 12V power supply unit
15:05 - Front panel connections
15:24 - Back panel connections
15:37 - Connecting ISP/USB to UART converter
15:44 - Building and flashing the firmware
15:54 - Testing the 6-channel speaker selector

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