[FritzS]

Hi,
have anyone test current dumping in headphone amps?
So to save energy as you need in class A power stages

My idea is a "current dumping light"

R6 is a part of current dump and put the output of the OPA direct to the headphone (at small signal level).
Q1, Q2 runs in Class AB (less idle current), in the original current dumping amp the power transistors runs in class B.

More about the current dumping I found here .....

http://quad405.com/currentdumping.pdf

http://quad405.com/jaes.pdf

http://www.quad405.com/

http://ourworld.compuserve.com/homep...ce/curdump.htm

http://ourworld.compuserve.com/homep...ice/dumper.gif

 

[perfectturmoil]

I don't think you'll get a great benefit from this...

From what I can see looking real quick it seems to be a way to trick a higher power class B amplifier into being more like class AB (at least at low output)..

Your biasing diodes turn your output into class AB as you said.. However, your opamp will also have a class AB output.. So I don't think the 'current dump' topology will help you much..

If your input was a class A (but you listed some generic opamp) then maybe.. Simulate a slightly less linear class A output at low volumes.. However, what you've got seems to be a slightly less linear AB at low volumes, then a higher power AB at high volumes..

You might as well just use the AB output buffer alone... Unless I missed something somewhere in there..

(I'm an EE by the way)