DIY active subwoofer filter circuit 

This video shows how to build an active subwoofer filter circuit. This filter system provides the frequencies required to run the subwoofer within its limits.
This video shows all the steps of this project including, soldering, mounting, and adjustments.
Additional details and all the KiCAD project files are available at jayakody2000lk.blogspot.com/20....
The filter calculation application is available at dilshan.github.io/subwoofer-f....
Content of the video:
00:00 - Soldering SMD components to the PCB
01:22 - Soldering medium size through-hole type components
02:05 - Soldering voltage regulators
02:16 - Soldering remaining through-hole type components
02:38 - Enclosure and mounting pads
03:01 - Preparing back panel
04:01 - Preparing front panel
05:00 - Finished front and back panels
05:11 - Installing components to the front panel
05:36 - Installing components to the back panel
06:26 - Wire connections to rotary switch (from PCB)
07:25 - Installation of the step-down transformer
07:42 - PCB and transformer mounting procedure
08:53 - Wire connections to the front and back panels
11:31 - Installing TL071 op-amp
11:35 - GAIN control adjustment
11:56 - Finishing steps

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