dmc wrote:
bsgd wrote:
Well this is my LM3875 based chip amp!
It's basically a copy of Mark's
LM3875 gainclone chip amp.
I used 6800uF caps instead of the 10000uFs and also used an ALPS black beauty as volume pot.
The tranny I got from an old YAMAHA active subwoofer.
This is a great project for anyone willing to get into audio DIY. It's pretty straight forward to build and there's no high voltage to get you into trouble

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i'm interest this amp too, but i dont know how many ampere EMI filter it is.
it is 2A?

All the power amps I have built up to the last two valve amps I have used cheap power filters. It is a good idea and I'm sure does help with RFI clean-up. Also they are easy to install. I think if you can fit them in the case and you don't mind the extra work to mount them, go for it. As I said they can only help.
Another even easier way to help with real basic power filtering is to pass all active, neutral and earth wires, inside the case, through ferrite cores. Even heavy mains wire can be passed two or three times through a large ferrite core. An even more lazy versions of this is to pass your earth wire only two or three times through a ferrite choke (core). So not the active and neutral just the earth.
I earth all my chassis when the device has mains connected (and fuse the active). This stops RF being spread into the chassis which can radiate from the metal case into more sensitive components or if your signal earth and power earth are one, helps stop RF being mixed with the signal. These are very simple steps to take to reduce RF in the audio path and it DOES improve the sound.