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Ghetto TV speakers

A project log for My project site activities/misc projects

This is a quick summary of my new site and/or what I am doing.

kc-leeK.C. Lee 12/22/2021 at 17:130 Comments

It is kind of sad for what pass for speaker in sub $100 LCD TV  these days when I can hack a better one from mostly recycled junk I have.  It is not much to look at as most of the parts are already paid for one way or the other. i.e. recycled

Ironically the speakers I used are from my old CRT TV back in the days before form over function.  I cut up one old FedEx shipping box as they are a bit more sturdy than regular cardboard boxes.  If I only had cans of epoxy and fiber glass cloth around, I would try to build-up a more rigid shell.

I use old ball point pen to create creases lines for folding without damaging the cardboard.  Just to humor myself, I stuff the box reusing some of those foam sheet from usual chinese orders.  A few self tapping screws are used to loosely mount the speakers.

A $0.30 PAM8403 "3W" class D amplifier is used to power these speakers.  It runs off my TV USB port.

I have modded the amplifier by reducing the gain with the values from the datasheet as they weren't built correctly.  I think they were using 10K.

I also added a 5V power supply supervisor circuit to pull the /Mute to reduce the popping as TV powers on/off its USB.  I needed a few hundred millseconds on mine.

As usual, read the datasheet especially for cheap questionably modules .

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