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Discrete op amp headphone amplifier module, based on Marantz
Discrete op amp headphone amplifier module, based on Marantz
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Old 10th November 2013, 12:08 PM   #1
rjm is offline rjm  Japan
Richard Murdey
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Discrete op amp headphone amplifier module, based on Marantz
Default Discrete op amp headphone amplifier module, based on Marantz

** This is just a design idea and simulation to play with, the circuit is not guaranteed to be either stable or safe **

That said, it seems to be running well on the virtual bench.

Comments appreciated.
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Old 10th November 2013, 12:38 PM   #2
00940 is offline 00940  Belgium
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Rather weak output transistors, no ?
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Old 10th November 2013, 01:13 PM   #3
peranders is offline peranders  Sweden
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Discrete op amp headphone amplifier module, based on Marantz
You can play extremely high with those.
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Old 10th November 2013, 02:16 PM   #4
rjm is offline rjm  Japan
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Discrete op amp headphone amplifier module, based on Marantz
@00940

Transistor selection in LTSpice is lousy. I'd nominally be looking at BD135,136 or similar TO126 or TO220 types.

@Per

No kidding! Do we need 80 mW of low distortion class A power? Certainly not. But, we can get it from a thermal budget of 5~10 wpc idle draw, and this is not impractical to design for. Consider the output bias current to be highly "user variable".
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Old 10th November 2013, 05:36 PM   #5
00940 is offline 00940  Belgium
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Quote:
Originally Posted by rjm View Post
@00940

Transistor selection in LTSpice is lousy. I'd nominally be looking at BD135,136 or similar TO126 or TO220 types.
It is... have a look at Cordell's models , he has correct ones for bd139-140 (as well as other suitable transistors, usually used as drivers).
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