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Chip Amps Amplifiers based on integrated circuits

Hardwired LM1875 from ALiexpress
Hardwired LM1875 from ALiexpress
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Old 20th February 2021, 06:26 AM   #31
ttan98 is offline ttan98  Australia
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Thanks, everyone for contributing. I agree with some and disagree with others.

I don't have any more to add or contribute, hence I declare this thread closed.
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Old 20th February 2021, 11:30 AM   #32
adason is offline adason  United States
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Location: Maryland
Not until we say so...
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Old 25th April 2021, 06:19 AM   #33
ttan98 is offline ttan98  Australia
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Join Date: Apr 2006
Location: Melb
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The unit I bought. See the hardwired LM1875, the image below.

I thought I will give you guys the update of the Hardwired LM1875 module I bought for 2 channels.

It arrived many weeks ago now I manage to put it together in a testbed. See the image below, it's for testing purposes only. If it sounds good I will put it in a proper case.


1. Powered up with about 17Vac--0--17Vac. First up no problem and I can hear music.

2. Sound seems ok, so far no distortions for the time being no critical listening as yet, I bought to replace my Tube EL84 which generates about roughly the same power, 12-15Watts per channel.

3. I am using this amp to drive a tweeter or a low-powered full ranger in an active DSP x-over configuration.

4. Note that the coupling capacitor is a large red cap., and also the bypass cap both can be bypassed in another LM3886 chip amp. Because of the input Offset voltage, I will get an output offset whether it is acceptable I yet to find out.

5. After testing and listening I will come back to advise you whether it is worth buying. I won't give you a blow by blow updates.

Thanks for reading.
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File Type: jpg IMG_20210425_145440.jpg (488.7 KB, 133 views)

Last edited by ttan98; 25th April 2021 at 06:36 AM.
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Old 25th April 2021, 06:36 AM   #34
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
It is worth buying just as a piece of electronic art.
Just appreciate the craftsmanship that goes into making something like this.

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Old 22nd July 2021, 07:51 AM   #35
ttan98 is offline ttan98  Australia
diyAudio Member
Join Date: Apr 2006
Location: Melb
Just completed my hardwired amp. just a little slack lately. Haven't evaluated the module for sound quality yet.
I thought you may like to see a few images, the power transformer is mounted in a separate box. The size of amp module in wooden box is about (W*H*D) is 16*7*13.5 in cm. Looks cute.
Attached Images
File Type: jpg IMG_20210717_151041.jpg (493.4 KB, 44 views)
File Type: jpg IMG_20210722_165626.jpg (295.2 KB, 43 views)
File Type: jpg IMG_20210722_165631.jpg (337.1 KB, 42 views)
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