耳機擴大機已經實驗 OK，將嘗試作成 精緻的小型 CLASS-A POWER AMP.
歡迎舊雨新知，來捧個人場，謝謝。 mtlin12 [:)]
http://www.diyaudio.com/forums/showthread.php?s=&threadid=54247
原文如下:
sziklai-darlington diamond buffer (SDDB) for power output stages Post #1
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Hi,
I've seen two interesting threads recently, one is
four transistor emitter follower (diamond buffer) as power output stage?
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quote:
capslock said,
The good old four transistor unity-gain buffer which consists of a complementary emitter follower, another emitter follower pair
that replaces the bias diodes and two current sources is very popular in complementary integrated op amp designs as well as
some discrete designs. For a schemetic, take a look at Sonny's page:
http://www.geocities.com/sonnya5000/basicb1.jpg
He did some nice simulations about distortion and how to improve it for low impedance loads.
What I wonder about : why is this nice topology apparently not used for power output stages? Is it because it is too difficult to
keep the bias constant?
Puzzled,
Eric
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the other is The Ultimate Suplifier
and found Marc. Vi's design gave me an idea , why not use
sziklai-darlington diamond buffer (SDDB) for power output stages ?
So I changed a little circuit of my own DB-01 headphone Amp,
to test the SDDB power output stages, and find it works very
good with my AKG-501.
I think it can be changed with only few components to
be a small Class-A power Amp.
here are the two circuits' pdf.files and pictures about the head
phone amp, please note the first output stage with only 4 bjts
, and the second with 6 transistors.
M.T.
[url=homepage20.seed.net.tw/web@3/asaas/PDF/DB-01%20headphone%20Amp%20V1.2.pdf]DB-01 headamp amp circuit[/url]
[url=homepage20.seed.net.tw/web@3/asaas/PDF/ULTIMA-SDDB%20POWER%20AMP%20V1.0.pdf]ULTIMA-SDDB CLASS-A POWER AMP[/url]
[:)]
，再來修改各項數值不遲。 
！) 圖也打不開，在 DZ 發表不是最好嗎 
。
！
