how about this output stage ?

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:scratch1:

i dont want to design ops driven from the one side (up or down)
i want audio injection like here.

i am not using double (symetric) bootstrap because i think its possible to make amplifier more prone to oscillation ?

Or it makes oscillation but these capacitors shorten out it ? C1,C2,C3,C4
 

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Most people would have some emitter resistors on those outputs. And unless
this is for a headphone amp those output devices are sort of wimpy. That device
is in a small package that's hard to conduct the heat from i wouldn't want to use it above
about 5w even on a good heatsink.
 
they are 40W and again for the test, im curious to see what happens :D
emitter resistors are not needed if there's no protection

Im puzzled because i found two formulas for Pd ->

(1/p^2)*(Vcc^2/Rload)
and
(1/p)*(Vcc^2/Rload)

2nd formula outs higher Pd.
 
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Ahh it was a mistake, i was reversed transistor pins.
it was BCE now is ECB for those packages :D

It sounds veery goood :p :drink: :Popworm: :darkside: :Piano: :scratch1: :emoticon: :wiz: :wiz: :masked:

losing my time :rofl::wchair::irked:

No heat at all with big speaker but i cant get high volume, i dont know why.

P.S. Transistor failed when i pushed the low freq eq high and the bass kicked in :(
Heatsink cold but maybe these transisors are small and there are peak currents
Maybe they are useful for bi-amping for mid and high frequency
 
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Just a reminder to play by the rules here. No one is under any obligation to contribute to the thread... and mosfet, you might do better to try and listen to all the advice that is being given and try and see one thread through to a meaningful conclusion rather than keep starting new ones.
 
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