My LM1875 Build Thread (chip amp)

[jamesfeline]

3rd power supply option

 

[jamesfeline]

4th power supply option

 

[jamesfeline]

final 5th option

 

[jamesfeline]

thoughts ....

 

[jamesfeline]

I think I am going for power supply option 1 ...
it's a nice little compact robust PCB

 

[jamesfeline]

well I did have another 6th power supply PCB but have decided to keep this for a more powerful chip amp project ...

 

[jamesfeline]

started to make the power supply of choice ..

 

[jamesfeline]

Case will be something from hifi2000 (modushop) not sure yet, I will make a couple of power amps and see if I like them 1st before I commit them to a Enclosure
all the best

 

[adason]

If i just may make a comment. I like the sound of lm1875. I do have about dozen different amps based on this nice chip. While the standard circuit sounds ok, there is much more improvement to be made if inverting configuration is used, and even more musical presentation can be achieved in transconductance configuration. Then there are nested circuits too, but i have stopped at current drive since i like the sound already a lot.

 

[jamesfeline]

If i just may make a comment. I like the sound of lm1875. I do have about dozen different amps based on this nice chip. While the standard circuit sounds ok, there is much more improvement to be made if inverting configuration is used, and even more musical presentation can be achieved in transconductance configuration. Then there are nested circuits too, but i have stopped at current drive since i like the sound already a lot.

Hello ... thanks for the info

 

[jamesfeline]

OK completed the power supply .. remember I have 2 of these as making monoblock amplifiers (well if I am happy with the sound etc) ...
Each power amp will have its own enclosure and will be used for my PC room
pictures attached

 

[jamesfeline]

I have made and modded the PCB as a drop in module so can be upgraded for updates later ... bigger diodes better more expensive capacitors etc, as trying to do this on a budget which is still proving changeling as parts are expensive like transformers and cases etc

 

[jamesfeline]

Each power amp will have its own power supply and transformer and may add a protection module of some description (not sure yet .. still pondering on this)
that's it for tonight will update when I have more progress to share ...
good night

 

[jamesfeline]

So have ordered 2 transformers tonight and the chips (LM1875) .. from RS UK, will update with more details soon ...