high current discrete audio buffer

[umut1001]

Hi.I want to build a discrete buffer with my components to drive my sennheiser hd25 and other headphones.And also want to use it before amplifiers.I do not want a preamp or opamp based circuit because they have feedback and it lowers bandwith..I had a look at internet but could find a good one.But i need a good schematic.I have these components

1) matched 2sk170/sj74
2) matched bc547c/557c - 546b 556b
3)bd 139/bd140
Maybe can use some other good components too

Any suggestions ?thank you very much

[wahab]

a NE5532 + bc546/556 + bd139/140 can make
an excellent class A phone amp, with good bandwith (500khz is enough?)
and signal noise ratio (100db) , very low distorsion (0.001%)....

[umut1001]

can you post a schematic ?thanks

[Bigun]

Originally Posted by umut1001

I do not want a preamp or opamp based circuit because they have feedback and it lowers bandwith..

feedback usually increases bandwidth

[Nrik]

Something like this:

JEAN HIRAGA - Le Monstre Amplifier PCB

Though you should increase 1 ohms to 10 ohms

[wahab]

umut,

i pôst one that should work very well...

BD139/140 must be mounted on smal
heatsinks, they dissipate 1 W each...

R9 must be settled depending of you phone impedance,
you will have to tweak to find the best sound for
your taste..

quiescent current can be changed modding R6/R10 ,
be carefull not to exceed the output devices ratings..

hope that it will help, anyway, the circuit is very easy to
redesign according to your exact needs..

[Lumba Ogir]

Hi,
conceptual proposal with derogative feedback.

[Lumba Ogir]

:

[Lumba Ogir]

Gareth,

feedback usually increases bandwidth

It does not, in an absolute sense.

[AKSA]

It does not, in an absolute sense.

More riddles. What do you mean precisely? Fb always seems to work for CRO traces.....