Getting extra voltage gain in the output stage

185

02:01:31

The old trick of increasing the voltage gain in the common collector push-pull output stage. Compare the two schematics.

published 7 years ago

jason9

7 years ago

Interesting design. I like it!

stanislav_maslovski

7 years ago

It was used in some portable transistor radios in the past. A little disadvantage of this specific design is that there is a dc current passing through the speaker.

wolframore

7 years ago

Just remove the DC bias with cap inline with output and resistor to ground. :)

stanislav_maslovski

7 years ago

Of course, and I am aware of that! Note that I wrote "this SPECIFIC design" :)

hurz

7 years ago

@wolframore, thats the trick to get a bootstrap over the coupling capacitor for the loudspeaker

hurz

7 years ago

anyway, with some extra negative feedback just a little change in circuit the distortion can be significant decreased http://everycircuit.com/circuit/6208805796052992

jason9

7 years ago

The only DC present in the speaker seems only to be a few mA, so it doesn’t need to be worried about.

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