yes but the dac i use with my tv dosent. thats the main issue. i didnt want to go deaf so i used the dongle dac
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You're using single supply, you need a voltage divider on the non-inverting input. Something like this:
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here is the current stage of this amplifier main issue is heatsinking and power delivery if i were to use a transformer.
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Yes but why, using separate power supply for the pre amp when you could incorporate it in your amp. ,
at this point none. i want to make this amp and the class ab amp and have an comparison on which one sounds the best.
You can use the " brick " power supply , single rail. No need for dual rail for the pre amp , op amp.
looks more like biasing than an virtual ground but it does make a lot of sense in this circuit
the brick loves to make ground loops with other bricks an power transformer provides an layer of isolation
the non inverting input ( and output ) of the op amp is at half the supply ( virtual center ) so the signal can swing ( positive and negative ).
I didnt have that problem but , It can happen , depends how well the " bricK " is built. Going "center tapped transformer" two rails would be nicer because you can eliminate the output capacitor to the speaker.
but its an class a amplifier with no global feedback loop or any other form of thermal conpensation so the speaker out would get 100mv or even 1V very quickly
You haven't said what your goals are , you want something to sound nice, build it yourself . Initially I thought you wanted Class A .
You can also try a chip amp , they might surprise you. I use the TDA7375 for my PC speakers and it sounds very good. Needs only one rail, enough power.
main issue with class a is of course heatsinking id need to find big enough heatsinks and power transformers that totals to around 50$ or 200pln
I doubt you can tell the difference ( from a good design class A and a good AB amp. Class AB will have lower dist then the class A , even if your class A will have no crossover distortion ( because it conducts 360 ) . With enough ( and doesnt take much ) quiss current any AB will have no crossover distortion .