Ask good questions and expect good answers...I have been here several times trying to create a good audio amplifiers and amplifiers so far I haven't had any help creating an amplifier.
No, why should they? Audio has no DC in it so coupling capacitors are used at the input and output of my amplifiers so that the circuit can swing the signal up and down. The circuit is biased at half the supply voltage which is 0V when there is a dual polarity supply. When powered by a dual polarity supply the coupling capacitors do not block DC, they are simple highpass filters which are also needed with a single polarity supply.So what about power supply for your amplifier circuits aren't they suppose to be dual polarity also?
Preamps with two transistors and AC and DC negative feedback were used 50 years ago to replace vacuum tubes. Audio opamps are used today.On the other note is there a good design format that I can start off with for the preamp that you know of or should I start a design and let you see what I come up with
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