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Chip Amps Amplifiers based on integrated circuits

The LM1875 for best
The LM1875 for best
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Old 15th December 2020, 09:10 AM   #131
mjona is offline mjona  New Zealand
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The problem you or anyone potentially interested will have is executing a compact pcb layout.

Some of that difficulty could be relieved by buying kit modules for LM1875 of which you will need several to make a stereo amplifier. There are kits for the stereo version of this chip the LM1876 - for example see LM1876 60W Digital Amplifier Audio Board Dual Channel Amplifier Board for 4 8 ohm Speaker DIY/Finished Board B9 006|Amplifier| - AliExpress

You could use two kits to make a pair of bridge amplifiers with these.

The kit stereo pairs are non-inverting so you would need to use op.amps to invert the phase of one of each pair. The outputs have dc protection so you don't need to invert the wheel with separate discrete component design.
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Old 15th December 2020, 11:35 AM   #132
kokoriantz is online now kokoriantz  Lebanon
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I leave such possibilities to FauxFrench. As i already mentioned, I couldn't get as good sounding LM3886 in bridge as single, even with center tapped input transformer. If 4 lm1875 burn 40w /ch. at quiescent It must deliver as good sound as class A and this to 80W. This is the purpose of my amplifier.
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Old 16th December 2020, 01:11 PM   #133
kokoriantz is online now kokoriantz  Lebanon
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The LM1875 for best-pcb-jpg
This the best layout I came upon. 42v and ground arrive at the center by twisted pair to link the heatsink by the ground to power the amps by the tabs. The 42v reach the amps by T as it conducts current on both polarities to be decoupled by Wima 10uf 50v PET capacitor which gets itls ground from the ICs. The supply feet holes of amps is oval to insert 100nf ceramic along the flat feet inserted from bellow, the 42v lead of the ceramic follows the foot up to the root of the IC.
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Old 21st January 2021, 09:17 PM   #134
yoaudio is offline yoaudio  United States
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The LM1875 for best
Any updates?
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Old 21st January 2021, 10:12 PM   #135
kokoriantz is online now kokoriantz  Lebanon
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This project has been put aside for a while by lack of means for real world trials.
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