I’ve decided to take on a small project into building a 2.1ch audio amplifier.
I’m using some LM1875T audio IC’s (this one: http://www.kynix.com/Detail/1328747/LM1875T.html, and the datasheet see: http://www.alldatasheet.com/view.jsp?Searchword=LM1875T) and I want to know how to build a bridge amp out of them.
Do you just connect the outputs + and - together and that’s it? Is it that simple?
I read through some of the datasheet and saw that it is applicable for a bridge amp but I can’t find to many details on how exactly to bridge it. Just for reference my plans are to bring the L/R signals into a summing amp and then run that into my LM1875 with a LPF of 300hz or so.
I run my circuit’s on Multisim and I get pretty good results in a AC analysis through my summing amp but I don’t know what exactly goes on when you bridge. I’ll keep checking back and if I don’t get much info I’ll see about using a different IC to get more power to my sub. I just like to stay around with the LM1875 because I’m somewhat familiar with the chip and their pretty convenient to design around.