saint.panda
Headphoneus Supremus
On a German Audio Forum, there's a rave on a headphone amp "HD53" by Cec (Audiocubes) which utilizes this new LEF (Load Effect Free) technology. This (slightly self-advertising) link explains roughly what LEF does:
http://www.candeias.com/english/lef.htm
A few excerpts:
Amps based on the LEF circuit do not require negative feedback
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Has anybody heard of LEF and is it the free lunch it seems to be or simply a real improvement over conventional circuit designs?
http://www.candeias.com/english/lef.htm
A few excerpts:
Amps based on the LEF circuit do not require negative feedback
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The breakthrough of LEF circuit is: The signal transistor does neither pass through its voltage characteristic Vce nor the current characteristic Ic. |
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As the signal transistor in LEF circuit does not handle the current requested by the speaker, loss in efficiency is negligible. |
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LEF’s most significant progress is splitting the handling of the loudspeaker’s current request from the music signal voltage output stage! |
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LEF means “Load Effect Free". This means: The signal transistor is not loaded by the speaker's current request, because he has strong current handling "assistants" - thus no sound degradation effects due to the load happens. |
Has anybody heard of LEF and is it the free lunch it seems to be or simply a real improvement over conventional circuit designs?