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mstechca said:I think Miles's design is still better. I have tried a circuit similar to the last design, and found out that even though the volume as louder, the transistors were heating up like crazy, especially when they were rated at 500ma.
mstechca said:I always ignore transformer and inductive coupling because:
a) Transformers cost alot of money
b) Transformers are too big
c) The signal might not pass through if the primary and secondary are far apart especially at microwave frequencies.
d) I have to worry about the inductance on two sides.
I ignore direct coupling because:
a) It wastes power
b) huge transistors may be required
c) The second stage can hog the DC power from the first stage, making direct coupling almost useless.
So that leaves me with capacitor coupling. Even though it places a frequency limit, I STILL USE IT because:
a) one stage wont hog DC power from another one because of a capacitor.
b) The current can be set by the resistor connected between battery and the coupling capacitor
c) results are generally better.
All opamps and most audio power amps are direct coupled and have none of the problems you have.mstechca said:I ignore direct coupling because:
a) It wastes power
b) huge transistors may be required
c) The second stage can hog the DC power from the first stage, making direct coupling almost useless.